What Is a Tech Pack & Why It’s Critical for Custom Bag OEM

Plan how to run a oem bag manufacturing program for North America: materials, tech pack, sampling, QC and shipping. Get OEM/ODM-ready checklists and quote

October 9, 2025 • 10 min read

What Is a Tech Pack & Why It’s Critical for Custom Bag OEM cover

Product render

Guide

How a Custom Bag Actually Gets Made, Step by Step

What the production team controls (process, not hype)

A useful visit audits control points; it should never feel like a showroom tour.

Workflow on the production floor: step by step

RFQ alignment: confirm claim scope, target cost, and packout rules before sampling.
By spec, material sourcing locks the coating/laminate spec, fabric route and trim vendors.
Pattern & measurement control: create templates, tolerance map, and reinforcement plan.
Keep shade lots in order; verify marker efficiency and grain direction when cutting.
Critical-zone reinforcement, then seam allowance and stitch spec, enforced at sewing or welding.
Use placement jigs during final assembly to install hardware, logos and accessories.
Inspection & packing: apply AQL sampling, carton marking, and shipping documents.

Typical buyer use scenarios

brand launches
wholesale programs
corporate procurement
retail distribution

Key functions buyers request most

custom sizing
durable construction
logo branding options
retail-ready packaging
consistent QC

Choosing the Best Materials for Custom Bags

Material	Performance	Cost Range	Leading For	Upsides & Trade-offs	Risks & How to Control
PU coated polyester (600D, as specified)	Good repellency (ISO 4920 / AATCC 22 per spec); moderate barrier (ISO 811 as specified)	US$1.2–6.0 / meter (per the specification)	Value/core lines where print clarity matters	Merits: cost controlled. Trade-offs: coating wear over time	Define spray rating targets and abrasion resistance benchmarks; protect high-wear zones
Recycled RPET (route, as specified)	Sustainability positioning; performance depends on coating/laminate (ISO 4920 / ISO 811 to spec)	US$1.5–3.8 / meter (per the specification)	Eco positioning programs and corporate procurement	Advantages: sustainability narrative. Trade-offs: supply stability and lot drift risks	Lock supplier lots, traceability and color delta; validate print and coating compatibility
Canvas / cotton (as specified)	Good hand-feel and print; waterproofing depends on finish (AATCC 22 as specified)	US$1.0–3.5 / meter (as specified)	Retail lifestyle lines, totes and promotions	Upsides: classic look. Limitations: heavier; stain risk without finish	Define shrinkage and colorfastness tests (AATCC 61 / ISO 105 to spec); specify lamination if needed

How to shortlist materials fast

Start from the scenario: abrasion zones, load points, and water exposure define the route.
Main compartment only is one option; decide if the claim spans the whole bag or zones.
Cite the ISO, AATCC or ASTM references in your pack and state what passes.
Pick trims that suit the chosen route: zipper type, sliders, buckles and webbing strength.
Print and branding compatibility is confirmed on the real fabric.
Evaluate transit rubbing risk, because visible creases are freight damage far more often than stitching faults.

Custom Design & Development Process

What to include in a buyer-ready tech pack

Artwork files: vector format, color codes, size, and placement coordinates
Construction notes: stitch type, stitch density, seam allowance, reinforcement mapping
Metal parts specs: zipper type and size, slider, buckle strength class, metal vs plastic
Branding method: print/embroidery/patch method, backing, and acceptance examples
Packing format spec: insert, polybag, carton count, carton marking, barcode placement
Testing plan: references and pass criteria (ISO/AATCC/ASTM as specified)

OEM/ODM development flow (practical)

Define target user, price band and positioning.
Lock claim scope, then confirm the test plan to spec.
To build it, add the BOM, then the measurement table, then the tolerance map, then artwork placement.
Prototype sampling validates fit, structure and the material route.
By PP, BOM and packaging route are final.
First, sign the QC checklists and golden sample; only then cut bulk.

Sampling checklist (avoid costly mistakes)

Confirm fabric shade and coating feel with the actual supplier lot (to spec).
Sign off cycles per spec only after zipper path and slider feel are checked.
Run the open/close and pack cycle many times: corner wear and seam creep are what to watch.
Test method pack resistance to scuff resistance, folding, and dampness before trusting it on the lane.
Changes stop at freezing, so bulk cutting runs without late feature creep.

What shortens the sampling loop

Repeatability beats one-off samples

Success example (anonymized): a value program targeting North America reduced rework by freezing a single tech pack, running one pre-production sample using the final BOM, and aligning QC checkpoints before cutting. Reproducible builds remove the annual need to qualify someone new when reordering.

Production & Manufacturing Methods for Bags

Ordering choices get clearer once you compare lead time, MOQ requirements and cost bands in the table.

Production Type	Lead Time	MOQ	Cost Level	Leading For
ODM catalog customization	6-10 working days + 35-50 days	low–medium (per the specification)	low–medium	Fast launches and proven silhouettes
Small-batch pilot run	6-10 working days + 35-50 days	500 pcs	medium	Startups, corporate gifting, SKU validation
Expedited production program	15–25 days (to spec)	by program	higher	Time-critical launches
New tooling / new specified materials route	sampling + production per the specification	to spec	premium	New silhouettes and claim-led innovation

Manufacturing methods you should specify (by spec)

Custom Branding, Logo & Final Assembly

Logo methods we can support (select 1–2 per SKU)

Final assembly controls that prevent returns

Shipping, Logistics & Order Fulfillment

Logistics execution gates

Key Factors to Choose a Reliable Bags Manufacturer

Signing an OEM/ODM bags agreement? Clear this checklist beforehand.

Manufacturer selection checklist

Can they quote from a tech pack and explain assumptions?
Can they source the BOM and also suggest alternatives that meet spec?
Is there an AQL plan, and do QC checkpoints cover IQC through IPQC into FQC?
Can workmanship survive a flexible MOQ arrangement?
Can you expect firm lead times and a clear escalation procedure?
Does their track record include packaging and shipping into your market?

Site audit checklist (what to check in person)

Capability summary

What a bag tech pack has to contain before costing is even possible

A tech pack is the single document that converts an idea into a priced, repeatable product. It is not a drawing. A drawing shows what the bag looks like; a tech pack tells the cutting room what to cut, the line what settings to run, the trim buyer what to order and the inspector what to reject. Without it a supplier is guessing, and every guess is priced into the quote as risk.

The cost consequence is immediate. A complete pack allows a quote to be returned within 24 to 48 hours because fabric consumption, trim count and process time can all be calculated. An incomplete pack turns that into a week of questions, and the answers usually change the price. Sampling behaves the same way: a complete specification runs in 6 to 10 working days, and anything that has to be reverse-engineered from a photograph moves the project into the 12 to 15 day cycle.

Dimensions are the section most often underspecified. Every panel needs a stated size and a tolerance, typically plus or minus 3 mm on a cut panel and plus or minus 2 mm on a welded panel. Without a tolerance there is no basis for rejecting a unit, and an inspector working to AQL 2.5 under ISO 2859-1 has nothing to measure against.

Sections that are routinely missing

The bill of materials is where most packs are thin. Listing "polyester" is not a specification; listing 600D polyester, PU coated, 260 grams per square metre, with a stated hydrostatic figure under AATCC 127, is. The same applies to hardware: naming YKK number 5 coil rather than "a zipper", and Duraflex by part number rather than "a buckle", because a generic description allows a substitution at bulk that the brand cannot reject.

Cover sheet with revision number, date and the golden sample reference
Flat sketch with every panel dimension stated plus or minus 3 mm
Bill of materials with denier, GSM, coating and hydrostatic figures
Hardware schedule with named part numbers and finishes
Stitch specification: 8 to 10 stitches per inch, thread count, seam type
Artwork: vector file, Pantone TCX reference, placement in millimetres
Testing clause and the AQL 2.5 acceptance level

Two sections are almost always missing and cause the most damage. The revision log, which tells the line which version is current, and the testing clause, which names the standards the product has to meet. Without a testing clause the buyer and the supplier disagree about what "passed" means, usually at the point of inspection rather than at the point of costing.

A golden sample closes the loop. Once the approved sample is signed off it is retained as the physical reference, photographed against the revision number, and used to settle any question that the written specification does not answer. QUANZHOU JUNYUAN BAGS works from the pack as the single source of truth: it drives the 24 to 48 hour quote, the 6 to 10 working day sampling window and the 35 to 50 day bulk run. See the cost and quantity guide for how specification detail maps to price.

Frequently Asked Questions (FAQs)

What tolerance should a bag tech pack state on a cut panel dimension?

Plus or minus 3 mm on a cut panel and plus or minus 2 mm on a welded panel. Without a stated tolerance an inspector working to AQL 2.5 under ISO 2859-1 has no basis for rejection, which is how dimensional complaints start.

How detailed must the bill of materials be for a 24 to 48 hour quote?

It must state denier, GSM, coating type and hydrostatic figure, for example 600D polyester, PU coated, 260 grams per square metre, minimum 1,000 mm under AATCC 127. Listing only polyester forces clarification and pushes the 24 to 48 hour quote out by days.

Which stitch density and thread count belong on a bag specification sheet?

State 8 to 10 stitches per inch on load-bearing seams, the thread count in Tex, typically Tex 40 or Tex 70, and the seam type such as bound, turned or flat-felled. Bar-tacks at stress points are called out separately, with placement dimensioned in millimetres.

How should Pantone and logo placement be dimensioned in a tech pack?

Give a Pantone TCX reference, a vector artwork file, and the placement measured in millimetres from two fixed datum points such as a seam and a panel edge, with a plus or minus 3 mm print tolerance. A placement given only as centred causes most decoration disputes.

Why does a revision log matter more than the drawing itself?

The revision log tells the line which version is current. Without it, a superseded sketch stays in circulation and a bulk run of 500 pieces or more is built to an earlier specification. Every revision should carry a note of what changed and why.

Should a tech pack name hardware part numbers or generic descriptions?

Name them. YKK number 5 coil and a Duraflex part number with finish can be verified at bulk; a generic description allows a substitution that the brand has no contractual basis to reject, and the substitution usually shows in field returns.

How does a complete pack shorten the 6 to 10 working day sampling window?

Fabric consumption, trim count and weld parameters can be set immediately instead of being reverse-engineered. Anything that has to be derived from a photograph or a competitor sample moves the project from 6 to 10 days into the 12 to 15 day cycle.

What testing clause should a tech pack carry so inspection is not disputed later?

Name the standards and the acceptance level: hydrostatic head under AATCC 127, abrasion under ISO 12947, and inspection to AQL 2.5 under ISO 2859-1 with critical defects at zero. Without it, the meaning of passed is argued at inspection.

Your requirements go in; a structured RFQ checklist and manufacturing plan come out.

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Standards referenced in this topic

Linked programme guides: custom backpacks.

What a bag tech pack has to contain before sampling starts

A tech pack is the only document that both sides read the same way. Drawings persuade, samples convince, but neither is enforceable; a specification sheet with dimensions, tolerances and named materials is what an inspector holds in one hand while holding a bulk unit in the other. If a decision is not on that sheet, it will be made on the line by whoever is fastest.

The minimum viable pack has eight blocks. First, a flat sketch or photograph of every view, including the base and the interior. Second, a dimensioned specification with finished dimensions and a tolerance, because "approximately 30 cm" yields two different products from two different operators. Third, a bill of materials that names shell, lining, interfacing, foam, webbing, thread, zipper, hardware and labels. Fourth, a construction note covering seam type, stitches per inch, needle size, bar-tack positions and edge finishing. Fifth, artwork with placement dimensions. Sixth, colour standards with references and a fastness requirement. Seventh, hardware with brand, size and finish code. Eighth, packing and labelling.

Tolerances are the part most packs omit, and their absence is the reason approval samples and bulk goods drift apart. A cut panel tolerance of plus or minus 3 mm, a printed artwork placement tolerance of plus or minus 2 mm, a webbing width tolerance of plus or minus 0.5 mm and a colour tolerance expressed as a delta-E against an approved standard all cost nothing to write and remove an entire category of argument. Where a dimension is truly free, write "reference only" so nobody treats it as a specification.

Tech pack fields, the tolerance to write in, and what goes wrong when the field is blank

Field	Write this	Failure when omitted
Shell material	Denier, weave, coating type and weight, e.g. 600D polyester, PU 2 sides	Mill substitution with a lighter coating
Lining and foam	Denier or gsm, foam density and thickness in mm	Collapse of structure after three weeks
Finished dimensions	W x H x D with ±3 mm	Insert or device no longer fits
Zipper	Brand, gauge, type, tape colour, slider, puller, stop	Sample opens smoothly, bulk snags
Hardware	Brand, size, finish code, plating thickness expectation	Tarnish and nickel-release failures at destination
Stitch density	SPI, thread ticket, needle size	Seam grin and tear-out at stress points
Colour	Reference number, delta-E tolerance, fastness grade	Crocking and batch-to-batch shade drift
Artwork placement	Anchor point and ±2 mm, method, ink type	Logo sits high, or peels after wash
Packing	Pieces per carton, folding method, polybag spec, carton grade	Creased goods, crushed corners on arrival

Version control is what turns a document into a record. Every revision should carry a date, a version letter and a change log naming what moved, because the question you will eventually ask is not "what did we agree" but "when did we agree it". Keep the approved sample, the counter-sample and the signed golden sample together, and photograph the golden sample in the same lighting you will use for a claim. Sample fees run USD 50–150 and are credited against the first bulk order, which makes it reasonable to order a second round rather than accept a compromise you will pay for later.

Turnaround depends on how complete the pack is. A pack with named materials and hardware goes into sampling at 6–10 working days, while a complex build — moulded shells, welded seams, custom pullers — needs 12–15. Mass production follows approval at 35–50 days. Every field left blank becomes a clarification email, and clarifications are what push a 10-day sample into a 20-day one.

Turning the pack into an acceptance standard

Once the pack is approved, it becomes the inspection reference. Define defect classes before production: critical defects that make the unit unsafe or unsaleable, major defects that a customer would notice and reject, and minor defects that a picky eye finds but a shopper tolerates. Then sample under ISO 2859-1 at AQL 2.5, with Critical 0, Major 2.5 and Minor 4.0; AQL 1.5 can be requested where the product is premium or the retail channel is strict. Where performance matters rather than appearance, the pack should name the test and the threshold instead of an adjective: ASTM D5034 for grab tensile, ASTM D751 for coated fabrics, AATCC 8 for colour transfer, AATCC 127 for hydrostatic resistance, AATCC 22 for spray and AATCC 35 for rain.

Performance claims also need a compliance file. Reference REACH (EC 1907/2006) for European chemical restrictions, CPSIA and California Proposition 65 for the United States, EN 71-3 where the product is aimed at children, and OEKO-TEX Standard 100 or GRS where your marketing depends on them. Put the required evidence on the pack so it is collected during production rather than reconstructed afterwards at your expense.

If you want to see where a pack meets the cutting table, the stage-by-stage notes in bag manufacturing process show which lines on the sheet drive which operation, and the fabric entries under custom bag materials give the constructions you can name directly. For the commercial side of the same document, see what brands should check before signing an OEM bag contract.

Numbers age badly when copied into dozens of places, so the maintained version of this grid stays on quality control and certification.

Rather than repeat the same matrix here, keep the detailed grading with the central reference on material selection — it lists the acceptance numbers and sampling levels our team works to.