Waterproof Bag Design File Requirements: What to Send

Why File Completeness Moves the Quote Before the Price

A quotation built from a complete file set is accurate on the first pass. One built from a sketch and a target price is an estimate with assumptions in it, and the assumptions get corrected during sampling, which is the most expensive place to correct them. File completeness therefore affects the calendar before it affects the price, and it is the cheapest thing a buyer controls.

The mechanism is simple. Each missing file creates a question, each question creates a round trip, and each round trip lands inside the sampling window rather than before it. A tech pack missing artwork, hardware and tolerances generates three questions. Answered during quotation they cost a day each. Answered during sampling they cost a week each, because the sample cannot be finished until they are resolved.

There is a second effect worth naming. A complete file tells the production side what matters to the brand. A pack that names the acceptance test and the tolerances signals that those will be inspected, and it gets a specification built to them. A pack that names neither gets a reasonable product built to nobody's particular standard, which is fine until the inspection happens.

The Dimensioned Drawing: Three Views and Tolerances

The drawing is the manufacturing instruction. It should carry three views, front, side and base, at a stated scale, with overall dimensions and the dimensions that matter functionally: opening width, internal height, strap length range, pocket sizes and the position of every attachment point. A rendering is not a drawing, and a single view cannot express depth or a strap geometry.

Tolerances are what make the drawing enforceable. On soft goods with welded and sewn construction, a dimensional tolerance is normally expressed as a millimetre band, with a wider band on soft dimensions such as a packed height and a tighter one on functional dimensions such as a laptop sleeve opening. A dimension without a tolerance is a preference, and preferences are not checkable at inspection.

Two annotations are worth adding because they prevent the most common rework. Mark which dimensions are functional and must be held, and mark which are nominal and may drift with material behaviour. Then add a note on the measurement method, because a bag measured laid flat and a bag measured stuffed give two different numbers for the same dimension, and both are correct under their own method.

Panel Nest and Seam Map Files

The nest is the cutting layout: every panel, its shape, its quantity and its orientation on the material. It decides material efficiency, because a nest that uses the film width well saves money on every unit for the life of the product, while one that leaves irregular offcuts costs on every unit. Where a brand has a developed nest it should send it; where it does not, we produce it and return it for approval.

The seam map states, for every joint in the product, how it is made. Welded, stitched and taped, or both. It also states the weld width and any tape width. This file is the one that determines whether the product can be made as drawn, because a weld the electrode cannot reach, or a three-panel junction with no radius, shows up here rather than in a leaking sample.

Grain and stretch direction belong on the nest as well. Coated woven fabric behaves differently along the warp and the weft, and a panel cut on the wrong grain will distort under load or under heat. A grain line marked on every panel, plus a note on any directional print, prevents a sample that looks right empty and twists once it is loaded.

Panel quantity and orientation also belong on the nest, and they are the entries most often left implicit. A symmetrical bag may need two of one panel and one of another, and a panel that is cut face up on one side of the nest and face down on the other will not match in shade or sheen on a coated face. Stating quantity, orientation and any mirror requirement removes an ambiguity that otherwise surfaces as a visible difference between the left and right of the finished product.

A BOM Structure That Survives a Material Substitution

A bill of materials for a waterproof bag should name grades, not families. Nylon is a family; a 420D nylon with a stated weave and a stated coating weight is a grade. TPU is a family; a 0.15 mm polyether TPU laminate on a stated base cloth is a grade. Families cannot be quoted accurately and cannot be inspected, because there is nothing to measure them against.

The BOM should also separate shell, lining, reinforcement, foam, webbing, binding, thread and hardware into their own lines, each with a quantity expressed per unit and a unit of measure. Film and fabric are bought by the metre or by weight, hardware by the piece, and webbing by the metre. Mixing units in one BOM is the most common cause of a booking error on a first order.

Substitution is where a good BOM earns its keep. Each line should carry an approved alternative, or a note that no substitution is permitted without written approval. When a material becomes unavailable, a BOM with alternatives lets the booking proceed the same day. A BOM without them starts an email exchange at the point in the calendar where a day is worth more than it is anywhere else.

Hardware List With Finish and Load Rating

Hardware is the most common source of a failed sample that is otherwise correct. The list should name each component, its material, its size, its finish and its load rating. A buckle is not a buckle; it is a 25 mm acetal side-release buckle with a nickel-free finish and a stated break strength, and the difference decides whether it passes a pull test and whether it is acceptable in the destination market.

Finish is where most of the trouble sits, because a finish described as matching is not a specification. Named finishes are better: a standard plating reference, a named anodised colour, or a physical sample of the component. Where the design allows it, choosing a standard finish held in stock removes a plating lead time from the calendar and removes a shade argument from the approval.

Load rating should be stated for every component that carries weight: buckles, sliders, D-rings, strap adjusters and any lifting handle. The rating is verified by a pull test on the assembled product, not on the component alone, because the failure in service is usually at the attachment rather than in the hardware itself. We test the assembly and report the result at sampling.

Artwork Files: Vector Formats and Minimum Stroke Width

Artwork should be supplied as vector, in an editable format with outlines included, at the size it will be printed. A raster file at screen resolution cannot be scaled to a print area without quality loss, and redrawing it adds days to the sampling window before any physical work starts. Where only raster exists, send it at the highest resolution available and expect a redraw step.

Minimum stroke width is the constraint that surprises brand teams. Fine lines and small reversed-out text do not hold on a coated textile: ink spreads on a low-energy surface and fine detail fills in. As a working rule for screen print on a coated shell, keep strokes above roughly 0.3 mm and letter heights above roughly 4 mm, and increase both for small reversed detail.

Placement belongs in the same file. Give the anchor point, the distance from two reference edges, the scale and the rotation, and note which panel the mark sits on. A placement given as centred on the front panel produces different results on every interpretation, and it is the single most common cause of a print approval failing on the second round.

Colourway References and a Substrate Swatch

A Pantone reference is defined for ink on paper. The same reference on a coated textile reads differently because of the substrate colour beneath it and the sheen of the surface. The file set should therefore carry the Pantone or standard reference as the intent, plus a physical swatch on the production substrate as the standard. The reference gives the target and the swatch gives the tolerance.

The swatch set should cover every material that carries the brand colour: shell, webbing, binding, print and any lining visible at the opening. Each takes colour differently, and the eye notices a mismatch between adjacent materials far more than an absolute error. Approving them together, under the same light, is what prevents a bag that is technically matched and visibly wrong.

Lighting is not a detail here. Approvals made under warm retail lighting, cool office lighting and daylight give three different answers, and the correct one is the light the product will be sold or issued under. We recommend naming the lighting condition on the approval sheet and keeping one swatch set under it, so that a later dispute is resolved against a stated condition rather than a memory.

Lining, Trim and Internal Layout Schedule

The interior is where a waterproof bag succeeds or fails in daily use, and it is the part most often described in words rather than drawn. The schedule should give the lining material and finish, the internal layout with dimensions, the position of every divider and pocket, and whether any compartment is welded or stitched. A wet compartment, in particular, needs to state whether it is sealed from the main body.

Trim covers binding, edge tape, elastic, mesh, labels and any reflective detail. Each needs a material, a width and a shade. Reflective trim is worth a specific note because it is a performance component: the tape has a retroreflection value and a wash durability, and a decorative trim sold as reflective becomes a safety claim the brand has to support.

One layout note prevents a whole class of returns. Where the bag carries a laptop or a tablet, state whether the sleeve is suspended off the base and by how much. A sleeve resting directly on the base of a bag puts a device corner one layer of film away from a hard floor, and that is the most common single cause of an equipment damage claim on a commuter product.

Foam and stiffener placement deserves its own line in the schedule rather than a note on the drawing. Closed-cell foam floats and adds structure but traps nothing, while open-cell foam in a lining that cannot dry becomes an odour source within a season. Stating the type, the density and which panel it sits in lets the sample be built as intended and lets the second round remove it deliberately rather than by accident.

Labelling, Packaging and Regulatory Text Files

Labels carry the text that has to be right: brand mark, care instructions, material composition, country of origin and any regulated statement. These should be supplied as text in the file set with their placement, not left to be generated later, because a care instruction or a composition statement invented at packing is a compliance risk rather than a convenience.

Packaging files cover the polybag, the hangtag, the carton marking, the barcode and any insert. Barcodes should come from the brand's own allocation with the numbering supplied, and carton marking should state what appears on which face. Where a destination fulfilment centre has its own labelling rules, those rules belong in this file rather than being discovered after packing has started.

Regulated text deserves a named owner. We supply the material composition and construction description needed to support a claim, and we will print any statement the brand provides, but we do not draft regulated wording. Where a product is sold to children, evidence under CPSC rules applies, and where a claim touches a restricted substance list, REACH and RoHS declarations should be requested at quotation rather than at release.

The Test Specification File: Method, Duration, Pass Mark

This is the file most often missing and the one that decides whether the inspection is a measurement or an argument. It names the test, the method, the duration, the sample size and the pass mark. For a waterproof bag the usual entries are spray behaviour under AATCC 22, rain behaviour under AATCC 35, immersion behaviour under IEC 60529 and shell resistance under ISO 811.

Each entry should be written as a complete sentence of requirements rather than as a keyword. Naming IEC 60529 without a duration and a depth is not a specification, because the standard contains several test severities. Naming the method, the depth, the duration and the acceptable outcome is, and it is the version an inspector can actually apply at AQL 2.5 under ISO 2859-1.

The file should also state what happens on a fail, because that is the part that becomes contentious. Rework and re-present, a full sort at an agreed cost allocation, or rejection and remake. Deciding this before production, in a file that both parties hold, removes the negotiation at the moment when the goods are made and the calendar is tight.

File Naming and Revision Letters That Hold Up

A programme that runs two or three sample rounds exchanges a lot of files, and without a convention nobody can say which version was approved. The convention that works is short: project reference, document type, revision letter and date, in that order, with no spaces. Every revised file gets a new letter, never the same letter with a changed date.

Physical samples carry the same letter. A sample tag showing the revision letter and the date links the object to the file set, and it makes a mismatch visible on the bench. The failure this prevents is specific and common: artwork is revised, the sample is built to the old artwork, the buyer approves the sample assuming the new one, and the bulk is produced to the file the buyer never saw.

One more rule closes the gap. Never overwrite a file in place. Every round produces a new file with a new letter, and the old ones are kept. Storage is free and the alternative is a dispute about what was approved, which is not. We keep the full revision history with the order file and supply it with the drawing pack on request.

• Artwork supplied as raster rather than vector: allow a redraw before any physical work starts.
• No seam map: the construction has to be proposed, reviewed and approved before the first weld trial.
• Hardware named without finish or rating: a sourcing round is needed before the sample can be assembled.
• Colour given as a reference with no substrate swatch: a lab dip and swatch approval round is required.

What We Return: Drawing Pack and Approval Record

At the end of a sampling round the buyer receives the sample, the test results, the artwork strike-off, the material lot references and the approval record. The approval record names the revision approved, the criteria it was approved against, and any deviation accepted. It is the document that the bulk run is built to, and it should be signed by both parties before production starts.

The drawing pack includes the nest and seam map as built, which may differ from the version supplied. Where geometry was changed at the design for manufacture review, the change is marked and the reason recorded. A brand that receives this pack owns its own product in a way that a brand receiving only a sample does not, and that matters on the second season.

Test evidence travels with the pack as well: the weld coupon record with peel widths, the ingress result to the named method, the hardware pull result and the shade comparison against the approved swatch. Each carries a date and a lot reference, so that a bulk result can be compared against the sample result rather than against a general expectation.

Common File Gaps and the Days Each One Costs

Seven gaps account for most of the delay on a first submission. Artwork supplied as raster rather than vector needs a redraw. A missing seam map means the construction has to be proposed and approved. Hardware named without a finish or rating needs a sourcing round. Colour given as a reference with no substrate swatch needs a lab dip.

A missing test specification means the acceptance criteria have to be written during sampling. A missing pack specification means freight is quoted against an assumption. And a missing revision convention means the second round is spent working out what the first round approved. Each is individually small and collectively they turn a 6 to 10 working day sample into a month.

Send the complete set to service@junyuanbags.com or WhatsApp +86 177 5002 0688 and the first quotation will carry the sampling window, the production window and the acceptance criteria on it. Shell and hardware options are listed under products, the stage-by-stage sequence is in the custom production guide, and the sampling detail is in the sampling process article. Bulk production runs 35 to 50 days from the approved pre-production sample, and release is FOB Xiamen on T/T 30 per cent deposit and 70 per cent before shipment.

Frequently Asked Questions

Q1: What files are needed for a waterproof bag tech pack?

A: Twelve: dimensioned drawing with tolerances, panel nest, seam map, bill of materials with named grades, hardware list with finish and rating, vector artwork with placement, colourway references with a substrate swatch, lining and trim schedule, labelling and packaging files, test specification, revision log and packing specification. With all twelve a sample comes back in 6 to 10 working days.

Q2: Why is a seam map necessary if the drawing is complete?

A: Because the drawing shows shape and the seam map shows construction. It states which joints are welded, which are stitched and taped, and the weld or tape width. It is also where an unreachable weld or a three-panel junction with no radius becomes visible, which is otherwise discovered as a leak in the first physical sample.

Q3: Can artwork be supplied as a JPEG or PNG?

A: It can be sent, but vector is strongly preferred. A raster file at screen resolution cannot be scaled to a print area without quality loss, and redrawing adds days to the sampling window before any physical work begins. Where only raster exists, send the highest resolution available and expect a redraw step in the quotation.

Q4: What is the minimum stroke width for printing on a coated bag?

A: As a working rule for screen print on a coated shell, keep strokes above roughly 0.3 mm and letter heights above roughly 4 mm, and increase both for fine reversed-out detail. Ink spreads on a low-energy surface and fine detail fills in, so a logo designed for paper often needs a simplified variant for a coated textile.

Q5: How should brand colours be specified on waterproof fabric?

A: Give the Pantone or standard reference as the intent and a physical swatch on the production substrate as the standard. The reference is defined for ink on paper and reads differently on a coated textile because of substrate colour and sheen. Approve the shell, webbing, binding and print together under the same lighting condition.

Q6: What detail is needed on the hardware list?

A: Component, material, size, finish and load rating for everything that carries weight. A buckle should be specified as a 25 mm acetal side-release with a nickel-free finish and a stated break strength. Finish should be a named reference rather than a description such as matching, since a described finish cannot be inspected.

Q7: How should the waterproof test be written into the files?

A: As a complete requirement rather than a keyword. Name the method, the duration, the sample size and the pass mark: spray under AATCC 22, rain under AATCC 35, immersion under IEC 60529 and shell resistance under ISO 811, each with its parameters. Naming a standard without severity is not a specification.

Q8: Why does the BOM need grades rather than material families?

A: Because families cannot be quoted accurately or inspected. Nylon is a family; a 420D nylon with a stated weave and coating weight is a grade. Each line should also carry a unit of measure and an approved alternative, so a booking can proceed the same day if a named material becomes unavailable.

Q9: What should the packaging file contain?

A: Polybag specification, hangtag artwork and copy, carton marking showing what appears on which face, barcode numbering supplied by the brand, and any insert. Where a destination fulfilment centre has its own labelling rules those belong here, because relabelling at destination costs more than the whole packing operation.

Q10: How should files be named across several sample rounds?

A: Project reference, document type, revision letter and date, in that order, with no spaces. Every revision gets a new letter and no file is overwritten in place. Physical samples carry the same letter on their tag, which makes a mismatch between artwork and sample visible on the bench before the bulk is built.

Q11: What is returned after a sampling round?

A: The sample, the test results, the artwork strike-off, the material lot references and a signed approval record naming the revision approved and the criteria used. The drawing pack includes the nest and seam map as built, with any geometry changed at the design for manufacture review marked and the reason recorded.

Q12: What is the MOQ and how fast is sampling with a complete pack?

A: The minimum is 500 pieces per style per colour and sampling runs 6 to 10 working days with a complete file set on a known shell. A complex build, a new pattern or a made-to-order material moves to 12 to 15 working days. Bulk production is 35 to 50 days from the approved pre-production sample.

People Also Ask

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• What is the minimum stroke width for bag printing?