The Bag Sampling Process: From Tech Pack to Approved Pre-Production
Published: August 15, 2026 | 7 min read
Sampling is where good orders are saved and bad ones are caught. It is the cheapest insurance you can buy - see why sample before bulk and sample costs.
Step 1: Tech Pack
Send drawings, dimensions, material, hardware, and logo files (see logo file formats). The clearer the pack, the fewer revisions.
Step 2: Prototype
The factory builds one sample - often in substitute material - to confirm shape and construction.
Step 3: Revision
You mark changes; they iterate. Budget 1-2 rounds.
Step 4: Approved PPS
The pre-production sample becomes the bulk standard. Keep it as your reference.
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Frequently Asked Questions
What is a tech pack?
A spec sheet with drawings, materials, dimensions, and hardware for the factory.
How many samples should I expect?
Usually one prototype plus 1-2 revisions before the approved PPS.
How long does sampling take?
About 7 days at Yiwu factories for standard styles.
What is a PPS?
Pre-Production Sample - the sealed reference for bulk quality.
Should I keep the sample?
Yes - it is your legal and quality benchmark for the order.