Oct 7, 2026Sourcing & Importing

Bag Tech Pack Revisions: Control Sample Changes and Approvals

Control bag tech pack revisions with measured feedback, component impact reviews, a change log and one approved production specification.

5r5o11.webp
Quick answer: A complete tech pack for bags carries eight sections: dimensions and tolerances, material specs with weights, colours with Pantone TCX codes, construction and stitching notes, hardware with base metal and finish, logo artwork with placement, labels and packaging, and a reference bag or photos. With one, first samples typically land in 7 to 15 days. Without one, every revision round adds another week and the sample shows the factory's guess, not your design.
A designer sends us a mood board and asks for a quote. We quote it, because ranges are possible. But the sample that follows takes three rounds instead of one, and two of those rounds exist only because the brief never said what the designer already knew. A tech pack is how that knowledge survives the trip from your screen to our pattern table.

What a tech pack actually does

A tech pack is a factory-readable version of your design intent. It converts taste into numbers: weights, codes, positions, tolerances. The factory does not need your inspiration; it needs to know what to measure the sample against.
That translation has a business effect you can plan around. Sampling runs 7 to 15 days per round with a complete pack, and lab dip for a custom colour adds 7 to 10 days. Each incomplete section usually costs one extra round, so the pack is the cheapest schedule tool you own.

The eight sections, in the order factories read them

Dimensions and tolerances. Finished length, width, depth, strap drop and handle height, plus the tolerance you accept, typically plus or minus half a centimetre on soft bags. "Same as the photo" is not a dimension.
Material specifications. Fabric type and weight. Our canvas programs run 12 to 16 ounces and our PU default is 1.2 millimetres, but either way the number belongs in the pack, not in a conversation. Include the lining: our default is 210 polyester or cotton. Weight is where buyers quietly lose money: a tote specified at 12 ounces instead of 14 looks identical in a photo, carries differently in a hand, and prices differently at the mill, so the number in your pack is the number you will be quoted against.
Colours. Every colour as a Pantone TCX code, including the lining, thread and zips. "Navy" produces five different navies across five mills.
Construction and stitching. Panel layout, seam types, stitch density, and where the bag must be reinforced. Stress points such as handle anchors, strap junctions and zip ends are where bags fail, so this section decides longevity.
Hardware. Zipper types and sizes, buckles, rings and feet, each with base metal and finish. Our hardware default is zinc alloy. If a piece is custom, say so explicitly, because custom hardware carries tooling and its own lead time.
Logo and branding. Vector artwork (AI or PDF), with placement, size and application method: print, embroidery, deboss or metal plate. A screenshot is not artwork. Once the pack is ready, the sampling stages it feeds run faster.
Labels and packaging. Woven label or printed care label, hangtags, polybag, carton count. Buyers who skip this section discover the carton math at shipping.
Reference. A physical bag to match, or clear photos of one. A sample you want matched removes more guesswork than any paragraph.

The one section buyers keep getting wrong

Construction is where AI-generated designs meet the sewing floor. AI renders draw handle points that no pattern can reinforce, folds that the specified material cannot hold, and hardware floating where nothing can attach it. We have started reviewing designs for exactly these contradictions before sampling, because the alternative is a sample that disappoints in week one and a redesign nobody budgeted.
The fix costs one day: send the design and the material together, and ask the factory to check the drawing against the line before anything is cut. If you are starting from an AI render, treat that check as mandatory.

How the pack changes your timeline

Complete tech pack + reference bag · First sample: 7-15 days · Revision rounds: 0-1 · Total to approval: 2-4 weeks
Partial pack (no hardware, no colours) · First sample: 7-15 days · Revision rounds: 1-2 · Total to approval: 3-5 weeks
Mood board and description · First sample: 7-15 days · Revision rounds: 2-3 · Total to approval: 4-7 weeks
The sampling cost is the same per round either way, which is why rounds, not days, are the number to control. Founders building their first pack can start from the brand-launch guide, which covers what to gather at each stage.

By buyer type: how much pack you actually need

First-time founder, one style · Minimum viable pack: Sections 1-6 plus a reference bag · Why: Covers the decisions that drive reorders
Brand with an existing style to modify · Minimum viable pack: Reference bag + a change list · Why: The original spec fills the gaps
Designer with full drawings · Minimum viable pack: All eight sections · Why: You have the information; write it down
Promotional buyer, standard tote · Minimum viable pack: Sections 1, 3, 6, 7 · Why: Stock construction carries the rest

FAQ

What is a tech pack for bags?
A tech pack is the written specification a factory builds from: dimensions and tolerances, material weights, Pantone colour codes, construction and stitching notes, hardware with finishes, logo artwork with placement, and packaging requirements.
How long does sampling take with a complete tech pack?
First samples typically take 7 to 15 days with a complete pack, plus 7 to 10 days for lab dip if a custom colour is involved. Incomplete packs add revision rounds, each with its own sampling time.
Do I need professional software to make a tech pack?
No. Factories need the information, not a file format. A clear document with photos, dimensions and codes works; a beautiful template with missing numbers does not.
What is the most commonly missing item in a bag tech pack?
Hardware specifications with base metal and finish, followed by tolerances. Buyers describe look and colour well but leave the parts that decide durability to the factory's guess.
Can the factory write the tech pack for me?
Factories can complete the construction and material sections from a reference bag, but positioning, dimensions and branding intent must come from you. Ask for a spec proposal against your reference, then confirm it in writing.

Next step

Open the checklist above and mark what you already have. Anything blank is a sampling round waiting to happen. Then send the pack with your target quantity through our contact page and we will come back with a quote and a sampling plan.
At Kaishi Bag Factory we sample from complete packs every week, across canvas totes, vegan leather bags and shoulder bags. If your pack is half-built, send it anyway; we will tell you which sections are missing before we charge for a sample. You can also see finished product examples.