Sea freight quotes from China are flat-rate per container. The container is the unit — not the chair. So how many chairs the factory can fit in one container directly drives your per-unit freight cost. A bad packing decision costs you 20-30% on freight, every shipment, forever.

The basic geometry

A 40 foot high cube container (40HQ) has 76.4 m³ of internal volume. Realistic loadable volume after pallets, gaps, and door clearance is around 65-68 m³. So each chair, fully packed in its carton, needs to fit into that space.

Assembled office chairs are voluminous — a typical assembled chair carton is around 90 × 70 × 80 cm (0.5 m³). At 0.5 m³ per chair, you fit 130-140 chairs per 40HQ. That’s expensive freight per unit.

KD packing changes the math

KD (knock-down) packing disassembles the chair into 4-6 components packed flat. A KD office chair carton is typically 78 × 58 × 28 cm (around 0.13 m³). That’s 4x smaller. So a 40HQ fits 410-480 KD chairs vs 130-140 assembled.

The trade-off: end customers have to assemble the chair on arrival. Most accept this if instructions are clear and tools are provided. For B2B office furniture buyers, KD is universally preferred.

Two packing modes most factories offer

• Standard KD (4-5 components separated): 410-460 chairs per 40HQ. Easy assembly. ~10 minutes per chair for the end customer.
• Compact KD (full disassembly): 480-520 chairs per 40HQ. Significantly more end-customer assembly time (~20 minutes).

For DTC brands, standard KD wins. For ultra-budget commercial orders, compact KD can drop landed cost per unit by US$3-5.

Optimising your specific chair

Three things to discuss with your factory when negotiating packing:

1. Carton dimensions. Ask for the exact length × width × height of the proposed packing carton, plus gross weight and net weight. Calculate yourself: container internal volume / carton volume × 1.1 buffer. That’s your per-container quantity.
2. Double-wall vs single-wall cartons. Single-wall is cheaper but tears in transit. Double-wall is standard for chairs going long distances. Don’t accept single-wall.
3. Corner protectors and foam blocks. Chairs with sharp components (gas lift, base spokes) damage cartons during stacking. Internal foam blocks and external corner protectors prevent this. Add ~US$0.30 per chair, prevent US$5+ per chair in damage rate.

The 20’GP vs 40’HQ math

Some chair orders fit better in a 20-foot container. The math:

• 20’GP internal volume: ~33 m³ usable. KD chair count: ~210-240.
• 20’GP freight cost: ~60% of 40HQ freight cost.
• Per-chair freight cost: usually higher than 40HQ.

40HQ is the standard for chair shipments above 250 units. Below 250 units, 20’GP can be the right answer despite higher per-unit cost, simply to avoid an LCL situation.

One thing not to forget

The “container loading quantity” on the factory’s quote is theoretical. Real-world loading at the port loses 5-10% to pallets, dunnage, and tilt-prevention. Always plan for 90% of the quoted container quantity.

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