Which Standard Goes in Your PO? Luggage Testing Clause by Clause

Almost every luggage purchase order contains a sentence like this:

"Goods shall meet all applicable international quality standards."

It reads like a safeguard. It is not enforceable. Two suppliers can both sign it, run completely different tests, and both be telling the truth — because the sentence names no clause, no specimen, and no pass criterion.

This is about the version of that sentence that actually holds up: which standard to write into the PO, and how to check that the standard you named contains the test you think it does.

1. Name the risk before you name the standard

Buyers usually start from standards they have heard of — ASTM, ISTA, CNS, QB/T — and then look for a test to attach. It works better backwards.

Six failure modes account for most luggage returns, and each one has a physical cause:

Pick the two or three risks your channel actually complains about, then attach a test to each. That gives you a standard list with a reason, rather than a list copied from a previous PO.

2. The five stations, and the clause each one answers

These are the five stations in our own lab, and the Chinese test-method standard each one maps to:

This table is the reason to write clause numbers rather than standard names: "QB/T 2920" and "walking test" are not the same instruction, and row 05 shows what happens when a named standard does not exist at all.

The parameter set behind each station — loads, angles, cycle counts — is published station by station on the interactive luggage testing lab.

3. Check that the standard you named contains that test

This is where POs quietly fail. Two clause systems are in common use, and they do not cover the same risks.

Read the empty cells, because that is where the disputes live:

• A buyer whose spec cites CNS 15331 and asks for a drum test has asked for something the standard does not contain
• A supplier whose report cites QB/T 4116 has answered a question the buyer never asked
• Nobody is lying. The two documents are simply different maps

Practical rule: never write a standard name without the clause number next to it. CNS 15331:2018 §4.3.5 is enforceable; CNS 15331 is a bookmark.

4. Write the specimen into the PO

Even a perfectly cited clause can miss your product, because a test report describes one specimen.

A report states a nominal weight, a size, and a shell configuration. Your PO states a different object. When they diverge, the clause was still run — on something else.

Write the specimen line explicitly:

Test specimen: 24-inch 4-wheel cabin case, shell 100% polycarbonate,
nominal load 8 kg, trolley system T-42, wheel assembly W-7.
Any change to shell material, trolley system or wheel assembly
requires re-test of the affected clauses.

That last sentence is the part most POs omit, and it is the one that survives a supplier change in week six. It also converts "we tested it" into "we tested this", which is the only version that protects you at inspection.

5. The one test with no standard anywhere

The stair rig is the honest gap, and it is worth stating plainly rather than hiding.

No Chinese, Taiwanese or international standard governs a stair test for luggage.

The station exists because the failure is real — wheels striking step after step, climbing and dropping off the far side, which is what happens on any station staircase. But no standard defines the step height, the wheel load, or the cycle count, so the test runs as a wear simulation under our own written procedure: same step height, same wheel load, fixed cycle count, recorded and repeatable.

What that means for a PO:

• Do not write "stair test to QB/T" — there is no such clause, and anyone who signs it is guessing
• Do write the procedure: step height, wheel load, cycles, acceptance criterion
• Do treat the result as comparative, not certified — it tells you which wheel survives longer, not whether the product conforms

More on how that gap is documented is on the testing lab page, alongside the four stations that do have standards behind them.

6. Where this sits relative to certification

Testing and certification answer different questions and are routinely merged in the same email thread.

• A clause test answers how did this specimen behave under this load
• A certificate answers does this product or this factory conform to a named standard, in a stated scope and period

Only the first one belongs in a mechanical PO clause. The second belongs in the document pack — and its validity dates matter as much as its contents, which is what our certification and compliance library publishes for each entry.

A clause in the PO, a document in the pack, and a plan for the container are three separate gates. The loading planner is the last of them and cannot compensate for the first two.

7. A PO clause you can paste

Testing (mechanical)
Specimen: <size, shell material, nominal load, trolley and wheel assembly>
Required, per finished model:
  - Walking endurance   QB/T 2920-2018  pass criterion: <…>
  - Drop, cold-conditioned   QB/T 2921  pass criterion: <…>
  - Oscillation         QB/T 2922-2018  pass criterion: <…>
  - Drum impact         QB/T 4116-2023  pass criterion: <…>
  - Stair drag          procedure: <step height / wheel load / cycles>
Report: clause numbers, measured values, specimen description, lab identity.
Re-test required on any change to shell material, trolley system or wheel assembly.

Four lines of specification do more work than a page of adjectives.

Frequently asked questions

Can I just ask for "ISTA" or "ASTM" instead? Those are recognised protocols for the same physical risks, and many US and EU buyers do specify them. The rule is unchanged: name the protocol and the procedure number, and confirm the lab is set up for it.

My supplier says they are "QB/T certified". Can they be? QB/T numbers are test methods, not a certification scheme. A report can cite QB/T 2920; nobody can be "QB/T certified".

What if the buyer specifies CNS 15331 and I only have QB/T reports? Map the clauses you do have, and state plainly which risks have no corresponding clause. Drum and oscillation have no CNS 15331 equivalent, so they cannot be substituted in either direction.

Which clauses should a first order include? At minimum walking (wheels), cold-conditioned drop (shell and corners) and oscillation (seams). Add drum impact if the channel involves high handling volume.

Does a passed clause test mean the whole order passes? No. It means the specimen passed. The order is covered by the specimen definition in the PO and by pre-shipment inspection against that same specification.

Written by CLK Luggage (Jiangxi Chengleke Leather Co., Ltd). The clause mappings and station list above are the ones we publish on our testing lab page; they describe our equipment and the standards it maps to, not a claim that every order is tested against every clause.