TL;DR: A poorly briefed quotation request for auto-bottom cartons costs you 2–3 extra sample iterations and adds 15–20 working days before you see a production-ready sample.
TL;DR: Suppliers need at minimum 6 data points to quote accurately — missing even one (commonly the fill weight) triggers a requote on board grade.
What Suppliers Actually Need Before They Can Quote This Structure #
Auto-bottom and crash-lock cartons are not a “send us your dieline and we’ll figure it out” category. The base lock geometry is mechanically constrained — the glue tab width, lock panel tuck angle, and board caliper all interact. A quote built on incomplete information is essentially a placeholder that will change.
When a brief lands on our desk, the first thing we check against our internal BOM-QR01 request form is whether six minimum fields are present: finished carton dimensions (L × W × D in millimetres), intended board grade or substrate preference, fill weight of the product, print configuration (one-side or both, colour count), surface finish, and order quantity tier. If any of these are missing, we hold the quote and ask rather than guess — because guessing on board grade alone can swing unit cost by 18–25% between a 350gsm SBS and a 400gsm coated duplex.
The fill weight point gets dropped from briefs more than anything else. Brand teams assume it is only relevant for structural testing. In our experience, fill weight is directly relevant to board selection from the very first quote: a crash-lock base carrying 600g needs a different base panel glue tab reinforcement than one carrying 150g, and that affects the die-cutting tooling cost, not just the board spec.
The Specifications That Drive Sample Accuracy #
Getting to an accurate white sample on the first attempt comes down to how clearly the structural brief is written. Here are the parameters that matter most, with the ranges we work within:
Finished dimensions: State these as internal dimensions if your product fit is tight. We convert to blank dimensions internally. A ±2mm ambiguity in stated depth becomes a ±4mm error in the glued blank because the base panels fold twice.
Board grade and caliper: For most retail auto-bottom cartons, we work in the 350–400gsm range on SBS or FBB, with calipers typically 0.38–0.48mm. For heavier products (above 500g fill), we move to 420gsm coated duplex at 0.50–0.55mm caliper. Stating “300gsm white board” tells us almost nothing useful — specify the substrate family.
Grain direction: This one matters structurally. For auto-bottom cartons, we prefer grain parallel to the depth direction so the base panels hinge cleanly under assembly force. Grain specified incorrectly in the brief leads to a white sample that assembles correctly but cracks at the score lines within 30–50 cycles in distribution.
Print and colour: Provide a colour mode declaration (CMYK, Pantone, or both). If you have Pantone references, list them — don’t expect us to extract them from a low-resolution PDF. Our offset lines are calibrated to G7 Grayscale targets, which means Pantone matching is done through our L*a*b* reference database, not visual estimation.
Finish: Soft-touch lamination, gloss UV, aqueous coating, or uncoated — each changes the lamination step and, for crash-lock cartons specifically, the base glue adhesion. Soft-touch laminate over the base panel interior can reduce glue bond strength by 15–20% if not masked in the dieline, so we need to know this before sampling, not after.
| Parameter | What we need | What causes a requote |
|---|---|---|
| Dimensions | Internal L × W × D in mm | Ambiguous or external-only dimensions |
| Board spec | GSM + substrate family + caliper | GSM only, or “standard white board” |
| Fill weight | Grams (product + primary pack) | Not provided — forces conservative board upsizing |
| Colour / Pantone | CMYK breakdown or Pantone codes | RGB files or low-resolution PDF only |
| Surface finish | Specific coating/lamination type | “Glossy” or “matte” with no further detail |
| Quantity | Tier breakdown (e.g., 5,000 / 10,000 / 25,000) | Single quantity only, no tiered pricing possible |
Sample Types and When to Request Each One #
Three sample stages exist for good reason, and skipping to the final stage to save time usually costs more time.
White (unprinted) structural sample. This is where we validate the dieline geometry, the base lock action, and your product fit. We produce white samples within 5–7 working days of a confirmed brief, using production-grade board at the specified caliper. If the brief is complete, we can hit correct fit on the first white sample in roughly 80% of projects, based on our 2023–2024 intake data. The remaining 20% need one dimension adjustment, usually depth.
Printed proof (short-run digital or offset proof). Once the structure is confirmed, this stage validates colour accuracy, Pantone matching, and finish. For Pantone-critical work — cosmetics, spirits, premium food — we require a signed off colour contract proof before we run the production plate. ISO 12647-2 governs our proofing standard on coated stock.
Production sample (pre-production run sample, PPRS). This is pulled from the first production run at production speed, on production tooling, with production board. Our standard is to pull 5 units from the first 500 and submit them for sign-off. Lead time from brief approval to production sample: 18–22 working days for standard configurations; add 5–7 days if custom die tooling is required.
Requesting a printed production sample without a confirmed white sample is the single most common sequencing error we see. Colour approval on an incorrect structure wastes a full proof cycle.
Decision Framework for Comparing Quotes from Different Suppliers #
If you receive three quotes for the same auto-bottom carton brief and they vary by 30%, something is not aligned — either the board grades are different, one supplier is quoting simplex lamination while another is quoting duplex, or the tooling cost is being amortised differently.
Ask every supplier to itemise: board grade (gsm + substrate + caliper), print method (offset vs digital), lamination type if any, die tooling cost (one-time vs amortised), and unit price at each quantity tier. A quote that bundles tooling into unit price looks cheaper per unit at low volume but more expensive once you scale.
If your annual volume is above 50,000 units, the tooling amortisation model matters less than board cost and press efficiency. If you are running at 5,000–10,000 units per order, tooling cost as a line item is usually $350–$650 for a new crash-lock die, and you should confirm whether it is reusable across reorders.
Some converters quote on FBB (folding boxboard) as default; others default to SBS. Neither is universally better — FBB has a stiffer feel at the same GSM due to its middle layer, which benefits tall, narrow cartons; SBS prints with slightly better dot resolution, which matters more for fine-detail cosmetic artwork. We will recommend one over the other based on your specific configuration, but a quote comparison only makes sense if both suppliers are quoting the same substrate family.
Specification Notes for Brand Partners #
When you brief us on an auto-bottom or crash-lock carton project, the most useful document you can send is a completed dimensions sheet with internal measurements, your product’s fill weight, and a colour-mode-declared artwork file (AI, PDF/X-4, or EPS at 300dpi minimum with 3mm bleed). If your artwork is still in progress, a dimensions brief alone is enough to start a white sample.
The gap that causes the most unnecessary back-and-forth is artwork submitted without a declared Pantone reference. If your brand colour exists only as an RGB hex code in your guidelines, we cannot guarantee a match under offset printing conditions without a conversion step — and that conversion should happen before sampling, not after the proof comes back looking different from your screen.
Our standard white sample lead time is 5–7 working days from brief confirmation. Printed proof adds 4–5 working days. If you need a specific in-hands date for a trade show or launch, work backwards from that date and share it with us upfront — we can tell you immediately whether the timeline is achievable with standard production or requires expedited scheduling.
Is a dieline file required to get a quote?
No. If you have finished internal dimensions (L × W × D) and a board preference, we can generate a preliminary quote and produce a dieline for your review as part of the sampling process. A dieline from your end speeds things up, but it is not a prerequisite for quotation.
What artwork file format do you accept?
We work with AI (Adobe Illustrator), PDF/X-4, and EPS. Files should be at 300dpi for raster elements, with all fonts outlined and a minimum 3mm bleed. RGB files and low-resolution JPEGs are not usable for print production without a conversion step that risks colour shift.
How many sample iterations should I budget for?
For a complete brief with confirmed dimensions, one white sample and one printed proof is the typical path. Projects with ambiguous dimensions or unresolved Pantone references average 2.3 iterations before production sign-off, based on our intake log from the past 18 months. Resolving both before the first sample request is the fastest path to production.
My supplier quoted 20% cheaper — should I just go with them?
It depends on what is driving the difference. Ask for a line-item breakdown: board grade, substrate family, lamination type, and whether tooling is included or amortised. If they are quoting 300gsm coated duplex where we specified 380gsm SBS, the structural performance will differ and the product may underperform at fill weights above 400g. Price comparisons are only valid when the spec is identical.
Planning a packaging project? Contact our team to request a complimentary specification review and sample quote.
