TL;DR: A poorly briefed sample request adds 2–3 iteration rounds before production approval — structuring your brief correctly the first time is the highest-leverage action you can take before contacting a supplier.
TL;DR: In our experience, over 60% of requotes on bakery and dry food packaging jobs trace back to three missing data points: inner dimensions (not outer), confirmed fill weight, and barrier specification.
What Artwork Files and Structural Data We Actually Need From You #
When a brand partner sends us a sample request for a bakery or dry food packaging line, we run it through what we internally call the S&Q Intake Checklist before assigning it to a structural designer. If more than four fields are blank, the brief goes back before anyone touches a dieline. That friction is avoidable on your side.
For artwork, submit files in AI, PDF/X-4, or high-resolution TIFF format at 300 dpi minimum for photographic elements and 1,200 dpi for line art and fine text. Include a 3 mm bleed on all sides (5 mm if the pack has a folded tuck-end that requires bleed continuity across the glue flap). Convert all fonts to outlines. If your brand uses Pantone references, provide the exact Pantone C or U code — “the gold that’s on our website” is not a briefable specification. For full-colour flexo-printed flexible pouches, also supply your colour profile in ICC format; our proofing workflow is G7-calibrated, so a G7-compatible profile will give you the closest match between proof and production.
For structural data, the minimum we need to price and sample accurately:
| Structural Parameter | What to Provide | Why It Matters |
|---|---|---|
| Inner dimensions (L × W × H) | In millimetres, filled state | Outer dims shift with board caliper and glue flap; inner governs product fit |
| Fill weight or volume | Grams or ml at fill | Drives board weight selection — a 400 g cracker sleeve needs ≥ 350 gsm SBS or equivalent |
| Barrier requirement | OTR, WVTR, or shelf-life target | Determines laminate structure for flexible formats; board treatment for folding cartons |
| Print process preference | Flexo, offset, digital | Each has different artwork prep requirements and cost profiles at different MOQs |
| Quantity tiers | Units per SKU, annual volume | Affects tooling amortisation and whether rotary or flatbed die-cutting is more economic |
| Regulatory market | US FDA, EU, Australia, etc. | Food-contact compliance differs by market — EU 10/2011 requires migration testing; FDA 21 CFR Part 176/177 covers coatings and films |
Missing inner dimensions is the single most common brief gap we see. Brand teams often specify outer box dimensions because that’s what they measure on a competitor product. But carton board caliper (typically 0.35–0.55 mm for 350 gsm SBS) adds material thickness to every panel, and a 2 mm discrepancy in a snack sleeve that holds a sleeve-packed biscuit stack will cause jams on your packing line.
Where Sample Requests Break Down — Three Failure Patterns #
The most common failure pattern we see on dry food carton briefs is a missing or vague barrier specification. A brand manager will request a “moisture-resistant coating” without stating a WVTR target. Moisture vapour transmission in baked goods packaging is not a binary on/off — a madeleine cake has a different acceptable shelf-life loss rate than a cracker. Without a numeric target (for reference, a common threshold for dry biscuit carton liners is ≤ 10 g/m²/24h WVTR at 38°C/90% RH per ASTM E96), we either over-engineer the structure (adding cost the brand doesn’t need) or under-specify it (causing a shelf-life failure at a later stage). Both outcomes result in a re-sample.
The second failure pattern involves flexible pouch briefs where the buyer provides artwork at 72 dpi, screen-resolution files pulled from a website, and asks for a printed proof. We cannot produce a print-ready proof from 72 dpi files. Upscaling raster artwork algorithmically degrades fine text below 6 pt and halftone gradients noticeably. We return these briefs with a file correction request, which adds 5–8 working days before sampling can begin. If a pre-press department isn’t available on the brand side, we can recommend a pre-press preparation workflow, but that needs to be scoped and agreed before the sample stage starts.
The third pattern is dimension ambiguity on stand-up pouches. Buyers often state a nominal pouch size — “180 × 260 mm” — without specifying whether that’s the flat dimension, filled profile, or finished seal area. On a quad-seal flat-bottom pouch for coffee or granola, the flat dimension and the standing filled dimension differ by 30–50 mm in height depending on the gusset fold depth and bottom pleat. Structural design cannot be validated against a filling line or shelf slot without knowing which dimension the buyer is measuring from. We ask for a filled sample or a dimensioned sketch as part of our QC-04 structural brief template for flexible formats.
Should You Request a White Sample Before Committing to a Printed Proof? #
Yes, for any structural format you haven’t run before. A white sample (unprinted, correct material, correct dimensions, correct construction) costs a fraction of a printed proof and lets you validate fit, opening mechanism, and filling-line compatibility before spending on colour proofing. For a new rigid windowed bakery box or a carton with a complex auto-bottom lock, we recommend a white sample first as standard practice.
The exception is repeat formats. If you’re refreshing artwork on a carton you’ve already run successfully — same dimensions, same board, different print — skip straight to a wet proof or digital press proof. Adding a white sample stage for a known-good structure only adds 5–7 working days for no structural validation benefit.
Specification Notes for Brand Partners #
When you brief us on bakery or dry food packaging, the information that most accelerates the process is: confirmed inner dimensions in mm (filled state), fill weight or product volume, target shelf life and the retail environment (ambient, chilled, high-humidity), your target market for food-contact compliance, annual volume by SKU, and a packaged product weight for freight and transit testing scoping under ISTA 2A or equivalent.
The brief gap that causes the most sample iterations is leaving barrier specification open. “Standard food-safe” is not a barrier specification. If you don’t have a WVTR or OTR number, share your product’s required shelf life and we’ll back-calculate a workable spec from our material library and EU 10/2011 or FDA 21 CFR compliance requirements for your target market.
Typical sampling timelines from brief approval: white unprinted sample, 7–10 working days; printed proof (flexo or offset), 12–18 working days; production-run sample from live tooling, 20–28 working days. Timelines extend if artwork corrections are needed, if food-contact documentation needs to be prepared from scratch, or if a custom structural die needs to be fabricated rather than adapted from an existing tool.
Frequently Asked Questions #
How do I fairly compare quotes from two suppliers when the structures look slightly different?
It depends on whether the structural differences affect shelf-life performance, filling-line compatibility, or food-contact compliance — or whether they’re purely cosmetic. Ask both suppliers to provide the full laminate or board specification (material grade, gsm, caliper, barrier coating type and weight), the food-contact compliance documentation relevant to your market, and the die-cut tolerance they hold in production (our standard is ±0.3 mm on sheet-fed folding carton). A quote that uses 300 gsm SBS where the brief specifies 350 gsm is not a fair comparison — it’s a lower-cost structure that may not perform the same on a filling line or in retail.
What’s the minimum information needed to get a ballpark price without a full brief?
Pack type, approximate dimensions, estimated annual volume, and target market (for compliance scoping) will let us produce a rough indicative range. Anything more precise requires inner dimensions, fill weight, and barrier spec at minimum. Ballpark pricing without structural details typically carries a ±25–30% variance, which is wide enough to mislead budget planning if taken as a firm number.
Do we need food-contact certification for every packaging component, including the outer carton?
For folding cartons and flexible pouches that come into direct contact with unwrapped dry food, yes — food-contact compliance documentation is required for all contact layers. For an outer shipper or a secondary display box where product contact is indirect or zero, the compliance obligation is lower, though some retailers apply their own supplier codes of conduct (for example, requiring FSC certification on all corrugated components regardless of direct contact). We flag the relevant compliance requirements by layer as part of the quotation.
Planning a packaging project? Contact our team to request a complimentary specification review and sample quote.
