Direct Answer
A sustainable packaging request for quotation is only as comparable as the assumptions you fix before it goes out. The winning RFQ fixes the unit of measure, the specification with tolerances, annual volume and order frequency, the delivery basis and Incoterms, the sustainability requirements with defined evidence, and a standard cost-breakdown sheet. Normalize every reply to one landed cost per finished unit, then compare material, conversion, tooling, freight, and compliance fees as separate line items. A quote that is 40 percent cheaper on the headline number is usually 40 percent different in scope; the RFQ's job is to make those differences visible before the decision, not after the purchase order.
Opening Hook
A food brand ran an RFQ for a molded-fiber insert across five suppliers, chose the lowest quote, and discovered in the first production run that the winning price excluded tooling amortization and assumed a pallet quantity nobody had agreed to. The gap between the quoted and landed cost was larger than the saving the brand had congratulated itself on. The problem was never the suppliers; it was that the RFQ let each of them fill a different blank. At ecosora, we structure packaging procurement for brands selling into regulated markets, and the RFQ is where the money is actually made or lost.
The Six Fields Every RFQ Must Fix
Comparability is a specification problem, not a spreadsheet problem. Fix these six fields in the RFQ document itself.
| Field | Why It Must Be Fixed | What Goes in the RFQ |
|---|---|---|
| Unit of measure | Suppliers default to their own unit | One finished unit, defined |
| Specification | "Recyclable box" is not a spec | Materials, dimensions, tolerances |
| Volume | Price collapses at scale | Annual units plus order frequency |
| Delivery basis | Freight hides in the gap | Incoterms and delivery point |
| Sustainability requirements | Claims need evidence | Recycled content, certification scope |
| Cost breakdown | Comparison needs anatomy | Material, conversion, tooling, freight |
The sustainability field deserves the most care on this site's projects. Do not ask whether the pack is "sustainable"; state the recycled-content threshold, the recyclability criterion, and the certification you will accept — for example EN 13432 or ASTM D6400 for compostable claims — then ask the supplier to name the document that evidences each one. A requirement with no named evidence document cannot be verified later, and an unverifiable requirement becomes a green-claims risk rather than a procurement advantage.
Normalizing Quotes to One Landed Cost
Once replies arrive, convert each to a common denominator: landed cost per finished unit delivered.
| Cost Element | Common Trap | Normalization Rule |
|---|---|---|
| Material | Quoted by weight, not unit | Mass per unit times material rate |
| Conversion | Includes or excludes scrap | State scrap rate, add to unit |
| Tooling | Amortized or expensed | Divide by agreed volume |
| Freight | Excluded or padded | Apply the same Incoterm to all |
| Compliance fees | Ignored entirely | Model EPR and fee modulation |
| MOQ penalty | Hidden in terms | Cost the actual order pattern |
Two structural costs rarely appear in an RFQ reply but decide the true ranking. The first is tooling treatment: a supplier that expenses tooling and a supplier that amortizes it over an assumed volume can show the same headline price with very different cash impact. The second is the minimum-order penalty, which bites a brand ordering in small, frequent batches. The total cost per unit model covers how these elements combine once normalized, and the same arithmetic applies to every quote in the round.
Data: ISO's standards catalogue covers the dimensional, material, and test standards that buyers cite when they want a packaging specification to mean the same thing to every supplier who reads it.
Judgment: Cite a named standard in the specification rather than a descriptive phrase, because a spec that references a published standard is enforceable during inspection while a descriptive one is renegotiated at every delivery.
Source: ISO — ISO Standards Catalogue (2024)
The Assumption Sheet That Kills Padded Quotes
Ask every supplier to attach a one-page assumption sheet to the quote. It converts a price into a testable claim.
| Assumption | What It Reveals | How to Test It |
|---|---|---|
| Scrap rate | Whether conversion is understood | Compare to process norms |
| Line speed | Whether the unit price is real | Ask for comparable runs |
| Volume tier | Where the price breaks | Re-quote at your pattern |
| Material grade | Whether spec is honored | Check against the BOM |
| Lead time | Whether capacity exists | Ask for the schedule |
| Sub-supplier | Where risk sits | Trace the fiber or resin source |
The assumption sheet is also the fairest negotiating tool in the process. When a supplier writes "price valid at 50,000 units per release," the buyer can either commit to that pattern or ask for the price at the real one, and both sides know which variable moved. A quote without assumptions is not simpler than a quote with them; it just moves the negotiation to after the purchase order, when the buyer has less leverage.
Scoring Technical Merit, Not Only Price
Weight the scorecard before replies arrive, so the ranking is not reverse-engineered from the cheapest number.
| Criterion | Suggested Weight | Evidence to Score |
|---|---|---|
| Landed cost | 40% | Normalized quote |
| Technical fit | 20% | Samples, test data |
| Sustainability evidence | 15% | Certification documents |
| Capacity and lead time | 15% | Schedule, references |
| Risk profile | 10% | Financial and geographic |
The technical and sustainability criteria are where a brand protects itself, because the cheapest quote often wins by assuming less. A supplier that cannot produce a letter of conformity for its own recycled-content figure will create a compliance problem at the moment the brand must prove the claim. Pair the RFQ with the supplier sustainability audit framework so the two documents ask for the same evidence and the buyer never collects a number it cannot source.
Data: ASTM International publishes test methods for packaging performance, which let buyers score structural and material claims on a shared method rather than on a supplier's self-description.
Judgment: Require the test method alongside any performance claim in the RFQ, because a claim that names no method cannot be repeated by a second lab and is therefore not a verified specification.
Source: ASTM International — ASTM Standards (2024)
Awarding Without Signing a Problem
The award decision is where procurement hands risk to operations, so close three loops before the PO.
| Loop | Close It By | Failure If Skipped |
|---|---|---|
| Scope | Written spec signed by both sides | Disputes at first delivery |
| Evidence | Named documents received | Claim cannot be substantiated |
| Escalation | Named contacts and lead times | Delays turn into stockouts |
| Change control | Written rule for material changes | Silent spec drift |
| Price validity | Term and index stated | Cost creep mid-year |
Award the business on the normalized landed cost and the evidence pack together, and put the assumptions in writing as contract terms. The most common post-award failure is not a bad supplier but an unresolved assumption: a material change that the supplier considered "equivalent," or a recycled-content figure that was quoted as a target rather than a guarantee. Rewrite every quoted assumption as a contractual commitment or delete it, and the RFQ will have done the job it was meant to do.
Data: The U.S. FTC's truth-in-advertising guidance requires that environmental claims be substantiated and not misleading, which applies to recycled-content and recyclability statements a brand makes on the basis of a supplier's quote.
Judgment: Treat each sustainability assumption in a quote as a claim the brand will eventually publish, so require the evidence document before award rather than after the first shipment.
Source: U.S. FTC — Truth in Advertising (2024)
The Bottom Line
A sustainable packaging RFQ is a comparability exercise: fix the unit, the spec, the volume, the delivery basis, the sustainability evidence, and the cost breakdown, then normalize every reply to one landed cost per finished unit. Score technical merit with the weights set in advance, and require the named evidence behind every claim. In one sentence: ecosora structures packaging RFQs and supplier evaluations so brand owners compare genuinely comparable quotes and buy verified compliance, not a headline price.