Quick answer: In plastic suitcase with wheels wholesale supply the price gap rarely sits in the shell. It sits in carton loading, volumetric weight, spare-parts rates and inspection terms; convert those four to a unit cost before comparing quotes.
Table of contents
- The Quote Splits into Four Blocks
- Cartons, Loading and Volumetric Weight
- Wheel Sets and Handles Set the Spare-Parts Rate
- Inspection Sampling and Transit Testing
- Retail Packaging and the RFQ Fields
- FAQ
1. The Quote Splits into Four Blocks
The commonest mistake in plastic suitcase with wheels wholesale sourcing is comparing unit prices. One 560 × 380 × 245 mm shell: A quotes 96 with wheels but no box, B quotes 118 with wheels, box and loading. The sheets look 22 apart; line by line the gap is under 3.
| Cost block | Unit | Range | Where quotes diverge |
|---|---|---|---|
| Shell and assembly | per unit | 78–96 | brass inserts, liner included |
| Wheels and handle | per set | 14–26 | diameter, tread, bearing, sections, lock type |
| Box and hang tag | per unit | 3.2–4.5 | print colours, plate fee |
| Inspection, loading | per unit | 0.8–1.2 | per man-day or load |
One cost never shows: mould ownership. A single-cavity tool sits near 42,000. If the buyer pays, the tool is theirs and moves at programme end; if the factory pays and recovers it over three orders, the price looks 6 lower, yet you still fund it after 1,500 units.
A vague mould clause keeps every price negotiable in the wrong direction.
2. Cartons, Loading and Volumetric Weight
Carton size is not the shell plus two centimetres: a 560 × 380 × 245 mm case ships in a 590 × 410 × 280 mm box at 0.068 m³. A 40HQ offers about 62 m³ usable; after a 2% levelling allowance that is 896 units, and the sea share of plastic suitcase with wheels wholesale cost is freight divided by it.
| Equipment | Usable volume | Carton | Units |
|---|---|---|---|
| 20GP | 28 m³ | 0.068 m³ | 413 |
| 40HQ | 62 m³ | 0.068 m³ | 896 |
| 45HQ | 78 m³ | 0.068 m³ | 1,147 |
Volumetric weight is the half of plastic suitcase with wheels wholesale costing buyers forget. The carton divided by 6,000 gives 11.3 kg against 4.2 kg actual, a factor of 2.7. Air and courier charge the larger figure, so buyers pay for 11.3 kg.
The mode decides which carton sizes work.
3. Wheel Sets and Handles Set the Spare-Parts Rate
Wheels and handles fail first and are the easiest lines to shave. One 6,000-unit plastic suitcase with wheels wholesale order logged 214 claims in 18 months, those two parts holding nearly 60%.
| Part | Claims | Share | Suggested spares |
|---|---|---|---|
| Wheel set | 82 | 38% | 2.0% |
| Handle | 45 | 21% | 1.5% |
| Latch | 31 | 14% | 1.0% |
| Other | 56 | 26% | — |
Three patterns stand out. Wheel failures cluster where the housing meets the shell; below 3 mm of wall, cracks open around the screw bosses within 12 months. Handle failures gather at the detent ball of the third section; aluminium wall under 1.2 mm and a detent under 8 mm repair more often. Latches are cosmetic, so complaints arrive before breakage and inflate their share. Those patterns fix the spare ratio at 2% wheel sets, 1.5% handles and 1% latches, the floor most batches live with. Push lower and you save on price while paying in freight and rework hours. A quote sitting 8 below market deserves one question: ball bearing or nylon bushing, because the answer explains the 8.
4. Inspection Sampling and Transit Testing
Inspection terms belong in the contract, or one batch yields two verdicts. A lot of 896 units at general inspection level II falls on code J, so 80 units are drawn, judged at AQL 2.5 for visual defects and 1.5 for function.
The inspection list covers:
- Wheels: all four down, none lifted over 2 mm, 50 m push without binding
- Handle: three sections out, 300 N pull without collapse
- Latches: 30 cycles, force between 40 and 60 N
- Shell: 1.2 m drop on six faces, no through-crack
- Pack: 30 minutes vibration, carton intact, liner in place
A full sea load mainly threatens stacking, so 6,000 N compression is enough. Air and courier need low-pressure and three-transfer drop tests, because baggage belts hit harder than a quay crane. Sea-approved packaging for plastic suitcase with wheels wholesale fails here, with corner crush above 5% in the air.
5. Retail Packaging and the RFQ Fields
Packaging sets the rhythm of the line. A colour box at 3.2 and a hang tag at 0.35 look trivial, but three-colour plates start at 800 and every artwork change re-cuts them; over 500 units that is 1.6 each.
An RFQ stating these gets answered faster:
- Shell outer and internal dimensions, tolerance ±1.5 or ±3 mm
- Target units per load, mixed colours allowed or not
- MOQ 500 per colour, plus 8% below 1,000
- Wheel set diameter, tread, bearing type
- Handle sections and locking method
- Box size, print colours, hang-tag material
- Inspection standard, level, who pays
- 7 days counter sample, 30 days production, 1 day inspection, 1 day loading
- 30% deposit, 70% against the bill of lading copy
- Tooling cost and ownership
Miss two and each follow-up pushes the ship date out by three days.
Conclusion
Four costs sit behind every plastic suitcase with wheels wholesale offer: loading, volumetric weight, spare-parts and inspection. Write mould ownership, MOQ, lead time and payment into the contract, and the plastic suitcase with wheels wholesale quotation becomes comparable.
This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.
Related Reading
- How to score a case supplier
- Factory tour checklist: eight stops on the floor
- Mould storage and upkeep standards
- Reviewing showroom samples
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