How to Compare Waterproof Bag Quotations on One Common Basis

A unit price is not a cost, and three of them are not comparable

The number at the top of a quotation answers the question "what does the bag cost at some defined handover point", and each supplier defines that point differently. Once you add what each quote left out — export handling, freight, insurance, duty, clearance, delivery, tooling, packaging, testing — the ranking frequently inverts. It is common for the quotation that looked thirty to forty percent more expensive on the page to be the cheapest once everything is on the same basis, and the reason is simple: the supplier quoting the highest number often quoted the widest scope. Proper quotation comparison therefore begins with landed cost normalisation, which is a mechanical exercise rather than an analytical one, and it is the step that almost everyone skips.

Skipping it has a specific cost. Buyers who compare raw unit prices systematically select the supplier with the narrowest scope, because narrow scope produces the lowest headline number. That supplier is usually perfectly honest — the exclusions are printed at the bottom — but the buyer has now committed to a relationship on the basis of a number that will grow, and the growth arrives as a series of small, individually reasonable additions rather than as one honest revision.

The fix is a spreadsheet with one column per supplier and one row per cost element, filled from evidence rather than from assumption. Where a number is genuinely unknown, estimate it, mark it as an estimate, and use the same estimate for every supplier — because a shared wrong assumption is far less dangerous than a different assumption per column. Our cost breakdown guide gives the line structure to work from, and our RFQ template is the upstream fix: most normalisation work exists because the RFQ let each supplier choose its own basis.

The six axes you have to put on one basis

Six variables account for nearly all of the incomparability between quotations in this category. Normalise all six before comparing anything, and record what each supplier actually said rather than what you assume they meant.

The discipline worth adding is to ask each supplier to re-quote on your basis rather than normalising silently. Send a one-page basis sheet — Incoterm, currency, validity, inclusions, payment terms, quantity — and ask for the price on it. Most suppliers will comply, and the ones that will not have told you something useful about how easy they will be to work with. Silent normalisation should be the fallback, not the default, because it embeds your estimates into a number that looks like a fact.

One caution about estimates: they are fine for ranking, but do not treat a normalised comparison as a final landed cost. Freight and duty in particular need real numbers from a forwarder and a broker before you commit. The comparison tells you which supplier to negotiate with; the landed cost model tells you whether the product works at all. Our logistics guide covers the freight side and our import guide covers classification and duty, and the World Customs Organization maintains the Harmonized System that product classification rests on.

Convert everything to landed cost per unit

This is the core exercise and it takes about twenty minutes. Take each quotation and add every cost required to get one unit from the handover point in the quote to your warehouse, expressed per unit at your real order quantity. The worked example below uses a mid-specification 25 litre welded dry bag at 2,000 pieces, and the numbers are illustrative of the pattern rather than a promise for any specific product.

Read what happened. Supplier C looked forty-two percent more expensive than supplier A on the quoted price and is sixteen percent cheaper once both are normalised, because C quoted a scope that included freight, duty and delivery. Supplier A’s number was not dishonest, but it was a partial price, and a partial price is not comparable to a complete one. This is the single most common inversion in the category and the reason the exercise is worth twenty minutes every time.

Two refinements make the table more honest. Amortise tooling over the quantity you will actually order across the life of the product, not just the first order — a mould that looks expensive at 500 pieces is trivial across 5,000. And include a contingency of two to three percent for the costs that always appear: demurrage, inspection, storage, a re-delivery. Every supplier gets the same contingency, so the ranking is unaffected, but the absolute number becomes one you can plan against.

Incoterms distort more than any other single variable

If you normalise only one axis, normalise this one. The gap between an ex works price and a delivered duty paid price for the same bag regularly runs twenty-five to thirty percent, and it consists entirely of things you will pay either way. The only question is whether they are inside the quoted number or outside it.

The rules themselves are published by the International Chamber of Commerce, and the practical points that matter for comparison are these. Under EXW you are responsible for export clearance and loading, which a foreign buyer sometimes cannot legally perform in the country of export — so an EXW quote can be unworkable rather than merely incomplete. Under FOB the supplier handles export and loading, and you handle everything from the ship’s rail onward. Under CIF the seller pays carriage to the destination port but risk still transfers at the origin port, which is the most widely misunderstood term in the set. Under DDP the seller carries duties and taxes, which is genuinely convenient and genuinely opaque — you will not know what the duty was.

For comparison purposes the practical recommendation is to convert everything to one reference basis, usually FOB plus your own landed model, because that is the basis on which you can see every component. If you prefer to buy DDP for convenience, that is a legitimate choice — but convert it to an FOB equivalent for comparison anyway, so you can see how much of the price is product and how much is logistics. A supplier’s DDP price that implies an implausible freight or duty component is worth querying.

Validity and currency: the price moves while you decide

A quotation is an offer with an expiry, and comparing a live offer against an expired one is meaningless. This sounds obvious and it is routinely ignored, because the expired one is usually the attractive one. Before comparing, confirm in writing that each price is still valid, and record the validity date alongside the number. If a supplier will not extend, treat its quote as indicative rather than as a price.

Currency matters in the same way but over a longer horizon. A price in the supplier’s local currency can look cheaper and then move against you between quotation and shipment; a price in your own currency transfers that risk to the supplier, which is priced in. Convert all quotes at one rate on one date for comparison, then ask the two questions that actually decide the exposure: how long is the price valid, and what happens to the price if the exchange rate moves beyond a stated band before shipment. A supplier willing to write a currency band into the quotation has removed a risk that most buyers carry without noticing.

There is a timing dimension too. Input costs for film, fabric and hardware move, and a quotation issued during a stable period may not be reproducible three months later. If your decision will take longer than the shortest validity period on the table, say so at the outset and ask all suppliers for the same extended validity, so the comparison stays live for the whole decision window.

Read the exclusion list, not the headline

The bottom third of a quotation is more informative than the top. It is where the supplier states what it is not pricing, and those statements are the entire difference between two apparently similar numbers. Make a list of every exclusion across all quotations, then check each one against the others — because an exclusion that appears in only one quote is a scope difference, and an exclusion that appears in all of them is a cost you have not yet accounted for anywhere.

• Tooling, moulds, dies and sample fees, and whether any of it is credited against the bulk order.
• Packaging beyond a basic bulk pack: individual bags, retail cartons, hangtags, barcodes, palletisation.
• Third-party testing and certification, and whether reports are provided per lot or once per programme.
• Artwork, plates, screens and any setup cost for branding.
• Documentation: certificates, declarations, origin evidence, and whether a set ships with each order.
• Spare parts, instruction sheets and repair material.
• Price adjustment clauses: material, currency, or quantity triggers that allow the price to move.

That last item is the one most often missed and most expensive when it fires. A quotation with a material price adjustment clause is not a fixed price; it is a price indexed to an input, and it should be compared as such. Ask what the trigger is, how the adjustment is calculated, and whether there is a cap. A supplier quoting a slightly higher fixed price is often offering something materially better than one quoting a lower adjustable price. Our tooling and mould cost guide covers the ownership question that sits behind the tooling line.

Payment terms have a price, and it is not zero

Payment terms are routinely ignored in comparisons because they are not a cost line, but they are worth money in two distinct ways: the cost of the financing, and the cost of the risk. Value both, or you will systematically favour suppliers that require the most money upfront.

Apply that as an adjustment rather than as a tiebreaker. If two quotes are within one percent on landed cost and one requires full payment upfront while the other offers thirty percent with the balance thirty days after delivery, the second is clearly better, and the difference is worth more than the one percent. Our payment terms guide sets out the mechanics of each option and where the charges fall.

One nuance worth noting: very generous terms from a supplier you have not worked with are not necessarily a gift. A new supplier offering net thirty after delivery is extending you credit it may not be able to afford, which is a signal about its financial position as much as about its goodwill. Terms that are appropriate to the length of the relationship are the healthy ones.

Compare at your real quantity, not at theirs

Suppliers quote at the quantity they think you will order, and when the RFQ did not specify a ladder, each one picks a different figure. A price quoted at 5,000 pieces compared against one quoted at 1,000 is not a comparison. Read every quote at the quantity you will actually place, interpolating from the ladder where necessary, and if a supplier did not provide a ladder, ask for one before comparing.

The shape of the ladder also tells you something the single number cannot. A steep drop between 500 and 1,000 usually reflects setup and material buy quantities, and means your real economy is in consolidating orders. A flat curve above 2,000 indicates a material-dominated product where further volume will not help much, and where the lever is the specification rather than the order size — which is precisely when a value engineering conversation is more productive than a bigger commitment. Where a quote leans on a quality management certificate, ask for the certificate number and the surveillance audit date rather than the logo: ISO publishes the standards most of those certificates reference, and a certificate without a current surveillance date is a claim rather than evidence.

Note also that the standard minimum in this category is 500 pieces per style, and a quotation below that level usually carries a setup component that distorts the comparison. If one supplier quotes a price at 300 pieces and another at 500, the first is not cheaper — it has spread the same setup cost over fewer units. Our MOQ guide explains what drives that floor and how it shows up in the price.

The dimensions that decide the outcome after the price

Once landed cost is normalised, the remaining differences are usually within a few percent, and the decision is made elsewhere. These are the dimensions that determine what the relationship costs you over a year, and they should be scored rather than merely noted, because they are the ones that separate two suppliers offering the same bag at the same price.

Reorder stability is the one most buyers overlook and it is worth real money. A supplier that holds its price on a repeat order for twelve months removes a whole category of re-quoting work and protects your retail price; one that re-quotes every order at market leaves you exposed to exactly the input movements you cannot control. Ask for a written price-hold period and score it. Our supplier scorecard uses the same dimensions for ongoing measurement once the supplier is qualified.

Sampling speed deserves a specific note because it compounds. A supplier that takes six to ten working days per round and approves in one round gets you to market weeks earlier than one that takes fifteen days and needs three rounds, and in a seasonal category those weeks are the difference between making the season and missing it. Our sampling guide sets out the normal rhythm, and our sample fee policy note explains how the cost is usually treated.

The cheapest quote is usually the narrowest one

This is the pattern worth internalising, because it explains most of the bad outcomes in sourcing. A supplier competing on headline price has a limited set of tools: reduce scope, reduce specification, or reduce margin. Reducing margin is the least attractive to the supplier and the least visible to you, so the competition happens on the other two. The result is that the lowest number on the page is systematically the one that defined the least — fewer inclusions, a looser specification, a thinner material, a wider tolerance, a shorter validity.

None of which makes the supplier dishonest. The exclusions are printed, the specification is stated, and if you read the whole document you will find them. The problem is that the comparison method selects for exactly those properties: ranking by headline price rewards narrow scope. Once normalised, the ranking usually changes, and the supplier that quoted completely moves up.

There is a version of this that is genuinely deceptive and worth naming: a low quote that is valid for a very short period. Seven days of validity on an attractive price is a common pattern, because the supplier knows the price is not sustainable and wants the commitment before anyone checks. Treat short validity on the lowest quote as a warning rather than as an opportunity, and ask what happens on day eight. A supplier that cannot hold its price for thirty days is not offering you a price; it is offering you an option that expires.

A scoring sheet for the final decision

Once the numbers are normalised and the qualitative dimensions are scored, put them in one sheet so the decision is visible rather than argued. Weight landed cost at forty percent and the rest across the dimensions above, score each supplier from one to five, and let the total decide. The value is not the arithmetic — it is that the decision becomes defensible and repeatable, and that two people looking at the same sheet reach the same conclusion.

The illustrative result is the common one: the supplier with the lowest headline price finishes last, and the winner is decided by a combination of complete scope and strong qualitative performance. If your sheet produces the opposite result — the narrow quote winning on merit — that is entirely legitimate, but you should be able to point at exactly which dimension earned it.

Add one row that the arithmetic does not capture: risk concentration. If the winning supplier would now hold more than roughly seventy percent of your volume, or would be your only source for a critical style, note it explicitly and decide whether to accept that exposure deliberately. Our second source guide covers what to do about it, and the answer is sometimes simply to accept it knowingly rather than to spend money qualifying a backup you will not feed.

Write down why you chose, not just what you chose

The decision record is the least popular part of this process and the one that pays off most reliably. Six to eighteen months later, three questions will be asked: why this supplier, why this price, and why not the other one. Without a record, the answers are reconstructed from memory, which means they will be self-serving and probably wrong. With a record, they are facts.

• The normalised comparison sheet, with the date and the exchange rate used.
• Every quotation received, with its revision reference and validity date.
• The scope differences found, and how each was normalised.
• The qualitative scores, and the evidence behind each one.
• The decision itself, in one sentence, with the deciding factor named.
• What would change the decision next time — usually a specific number on a specific dimension.
• Who decided, and who was consulted.

The practical value shows up in four situations, all of which are common. A price dispute at reorder, where the record shows exactly what was agreed and on what basis. A quality problem, where it shows what acceptance criteria were quoted and confirmed. A personnel change, where a new buyer can understand the decision in ten minutes rather than re-running the whole exercise. And an audit or a retailer onboarding, where evidence of a structured, documented sourcing decision is sometimes a requirement in itself.

The last item on that list — what would change the decision next time — is the one that makes the record useful rather than archival. Writing it at the moment of decision, while the trade-offs are still in your head, produces a far better re-quoting trigger than any policy. If you wrote "supplier B wins if its landed cost closes to within three percent", you know exactly what to check next quarter.

How often to re-run the comparison

A comparison is a snapshot, and the things that change it move at different speeds. Freight rates move fastest and can invalidate a landed comparison in a quarter. Currency moves continuously. Input costs move in steps. Supplier performance moves slowly and is best measured on the scorecard rather than in the comparison. Set the re-quoting cadence to the variable that moves fastest in your situation rather than to a fixed rule.

• Re-run the landed model whenever freight rates, duty rates or your order quantity change materially.
• Re-run the full comparison annually, or when a supplier’s scorecard band changes.
• Re-run it immediately if a supplier changes payment terms, validity practice or introduces a price adjustment clause.
• Do not re-run it every month. Constant re-quoting is read as price shopping, and it costs you the goodwill that gets you capacity in a tight season.
• Always re-run it before a significant volume step-up, because the ladder shape changes the answer.

And when you re-run it, tell the suppliers what you are doing and why. A structured annual review with a stated basis is a normal commercial process that suppliers respect; a surprise request for a better price is not, and it produces a defensive number. Share the basis sheet, share the decision criteria, and share the outcome — including with the supplier that lost, because a supplier told specifically why it lost can win next time, and that competition is worth having.

If you are at the point of collecting quotations, the most useful thing you can do first is fix the basis: state the Incoterm, currency, validity, inclusions, payment terms and quantity, and send it to every supplier with the specification. That single page removes most of the work described here. Review how a custom bag programme moves from first sample into bulk production and send your specification, target quantity and target market. Minimum order quantity is 500 pieces per style, sampling takes 6–10 working days, bulk production runs 35–50 days, and quotations are issued FOB Xiamen with the validity period, packaging basis and quantity ladder stated on the quote.

Frequently Asked Questions

Q1. Why are waterproof bag quotations so hard to compare?

Because each supplier defines the handover point differently. One quotes ex works, another FOB, another delivered duty paid, and each includes or excludes tooling, packaging and testing differently. Put all of them on one basis first.

Q2. What does it mean to normalise a quotation?

Converting each quote to the same Incoterm, currency, validity, inclusion scope, payment terms and quantity, then adding every remaining cost so each becomes a landed cost per unit at your real order size.

Q3. How much difference does the Incoterm make?

A great deal. The gap between an ex works price and a delivered duty paid price for the same bag commonly runs twenty-five to thirty percent, and every element of it is something you pay either way.

Q4. Can the most expensive quote be the cheapest?

Frequently. A quote forty percent higher on the page can be fifteen percent lower landed if the higher one includes freight, duty and delivery while the lower one excludes export handling, tooling and packaging.

Q5. How do I value payment terms in a comparison?

Value both financing and risk. Full payment before production is worth roughly minus two to three percent; balance thirty days after delivery is worth plus one to two percent compared with the usual deposit-and-balance baseline.

Q6. What should I do about short quotation validity?

Treat it as a warning, especially on the lowest quote. Seven days of validity often means the price is not sustainable. Confirm every price is still live before comparing, and ask for the same extended validity from all suppliers.

Q7. Should I compare prices quoted at different quantities?

No. Read every quote at the quantity you will actually order, interpolating from the ladder. A price quoted at 5,000 pieces is not comparable to one quoted at 1,000.

Q8. What belongs in the exclusion check?

Tooling and sample fees, packaging beyond bulk pack, third-party testing, artwork and plates, documentation, spare parts, and any price adjustment clause that lets the price move after you commit.

Q9. Why is the cheapest quote often the narrowest?

Because competing on headline price means reducing scope, specification or margin, and the first two are far easier for the supplier. The lowest number on the page is systematically the one that defined the least.

Q10. What non-price dimensions should I compare?

Sampling speed and first-pass rate, tooling policy and ownership, quality terms and defect remedy, reorder price stability, communication and documentation, peak-season capacity and compliance capability.

Q11. How important is reorder price stability?

Very. A written twelve-month price hold removes a whole category of re-quoting work and protects your retail price. A supplier that re-quotes every order leaves you exposed to input movements you cannot control.

Q12. How should I weight price against everything else?

A workable split is forty percent normalised landed cost and sixty percent across the qualitative dimensions. The point is not the exact weights but that the decision becomes visible, defensible and repeatable.

Q13. Why should I record the sourcing decision?

Because six to eighteen months later someone will ask why this supplier and this price. A record answers it with facts and is often needed for price disputes, quality problems, personnel changes and retailer onboarding.

Q14. What should a decision record contain?

The normalised sheet with date and exchange rate, every quotation with its revision and validity, the scope differences and how they were normalised, the qualitative scores with evidence, the decision in one sentence, and what would change it next time.

Q15. How often should I re-run the comparison?

Annually as a baseline, immediately if freight, duty, quantity or terms change materially, and before any significant volume step-up. Avoid monthly re-quoting, which reads as price shopping and costs you goodwill.

Q16. Should I tell suppliers I am comparing quotations?

Yes, and tell them the basis and the criteria. A structured review is normal commercial practice; a surprise request for a better price produces a defensive number and nothing else.

Q17. What if a supplier will not quote on my stated basis?

Note it as a qualitative negative and normalise their quote yourself, marking every estimate clearly. Reluctance to quote on a common basis usually predicts reluctance to be transparent later.

People Also Ask

How do I compare bag supplier quotes fairly?

Normalise first: same Incoterm, currency, validity, inclusions, payment terms and quantity, then convert each to landed cost per unit at your real order size.

Why is the cheapest quote not the best?

Because it usually has the narrowest scope. Once excluded items such as tooling, packaging, freight and duty are added, the ranking frequently inverts.

What is landed cost normalisation?

Adding every cost between the quoted handover point and your warehouse — export handling, freight, insurance, clearance, duty, delivery — so all quotes are expressed per unit on one basis.

How much do payment terms matter?

Roughly one to three percent of order value between full prepayment and balance after delivery, counting both financing cost and risk.

Should I compare quotes at different quantities?

No. Read each at the quantity you will actually order. A quote priced at 5,000 pieces is not comparable to one priced at 1,000.

How often should I re-quote a supplier?

Annually, or whenever freight, duty, quantity or payment terms change materially. Frequent re-quoting reads as price shopping and costs you capacity in tight seasons.