Why packaging matters
Why Packaging Quality Determines Your Cargo Safety
Export Packaging Briefing · August 2026 · Last verified August 2026
International cargo endures a harsh journey: forklift handling, container stacking, ship motion, temperature swings, and humidity. Poor packaging is the single largest cause of transit damage claims, accounting for the majority of rejected, crushed, or water-damaged shipments. Proper export packaging reduces damage claims, prevents customs holds, and protects your inventory value.
The core principle is compression plus isolation: the outer carton must absorb stacking pressure while internal cushioning isolates the product from shocks. Get both layers right and your cargo survives the voyage.
Cartons
Choosing the Right Carton Strength & Size
Use Double-Wall or Triple-Wall Board for Ocean
Ocean containers stack cartons up to 8 levels high. Use double-wall (BC flute) or triple-wall corrugated board for loads over 15 kg per carton.
Match Carton Size to Contents
Oversized cartons invite crushing; undersized cartons put stress on seams. Leave at least 5-8 cm of cushioning around fragile items on every side.
Verify Edge Crush Test (ECT) Ratings
Ask your supplier for the carton ECT or burst strength rating. A minimum 32 ECT for heavy export cartons is a good benchmark.
Run a Stack Test
Stack filled cartons 6-8 high in a dry room for 48 hours. If the bottom carton collapses or bulges, upgrade the board grade.
Cushioning
Cushioning Materials for Fragile Cargo
| Material | Best For | Notes |
|---|---|---|
| Polyethylene (PE) foam sheets | Fragile electronics, glass | Excellent shock absorption, resistant to moisture. |
| Air pillows / inflatable bags | Lightweight void filling | Cheap, space-efficient, great for filling gaps. |
| Honeycomb paper inserts | Eco-friendly fragile protection | Recyclable, high crush strength-to-weight ratio. |
| Polyurethane foam-in-place | Custom-shaped heavy items | Molded on-site around the product. |
| Bubble wrap | Low-cost general protection | Use 2-3 layers for glass and ceramic. |
Moisture
Moisture & Condensation Protection for Ocean Freight
Ocean containers experience extreme temperature swings — cargo sweats, condensation forms on container walls, and humidity soaks into unprotected cartons. Protect your goods with a moisture strategy.
- ✓Desiccant Bags: Use 1-2 kg of silica gel or clay desiccant per 20ft container, placed in corners and between cartons.
- ✓VCI (Vapor Corrosion Inhibitor) Film: Wrap metal parts and machinery in VCI film to prevent rust during transit.
- ✓PE Liners Inside Cartons: Line the inside of cartons with polyethylene film before placing goods, then seal tightly.
- ✓Ventilation Requests: For moisture-sensitive cargo, request a ventilated container (often called a "vented" or "coffee" container).
- ✓Elevate Loads: Keep all cartons and pallets off the container floor using pallets to avoid floor condensation and sweat damage.
Pallet stabilization
Pallet Load Stabilization: Wrapping, Corner Boards & Strapping
Full Shrink-Wrap Coverage
Wrap the entire palletized load from top to bottom so cartons cannot shift or slide during loading, lashing, and ocean motion.
Corner Boards
Add rigid cardboard or plastic corner boards on all four vertical edges. They prevent strap pressure from cutting cartons and add crush strength.
Edge Protectors Under Straps
Place plastic edge protectors wherever strapping crosses a carton edge to avoid compression damage.
Check Pallet Overhang
Cartons must not overhang the pallet edge — overhang causes forklift damage and unstable stacking.
Weight Distribution
Place heavier cartons at the base and lighter cartons on top so the stack does not crush its own lower layer.
Container loading
Container Loading & Lashing Rules
Follow the Stowage Plan
Load against the container rear wall first and fill gaps from back to front. Do not leave loose spaces that allow cargo to shift.
Lash Heavy or Rolling Items
Secure heavy machines and drums with lashing straps, blocking, and bracing. Rollers, dunnage, and air bags prevent movement.
Keep the Door Clear
Never stack cargo against the container doors; leave space so the doors can open fully at destination.
Distribute Weight Evenly
Keep the container balanced with a lower center of gravity. Heaviest cargo goes lowest and toward the container centerline.
Use Dunnage & Air Bags
Fill voids with dunnage (wood, paper honeycomb) or inflatable air bags to lock the load in place during sea motion.
Labels
Marking & Labeling Every Export Carton
Shipping Label Contents
Consignee name and address, port of destination, carton number (1 of 20), gross weight, net weight, HTS code, and country of origin.
Handling Marks
Apply international handling symbols: fragile, this side up, stack limit, keep dry, and center of gravity where relevant.
Barcodes & Tracking
Add GS1-128 or QR barcodes containing your shipment reference so warehouses and carriers can scan each carton electronically.
Dangerous Goods Marks
For hazmat cargo, apply the UN number, proper shipping name, and class diamond placard on each package.
Hide Commercial Value
Avoid printing high-value branding or "fragile electronics" text that attracts theft. Use neutral markings instead.
FAQ
Frequently asked questions
What is the best packaging material for international shipping?
How much cushioning do I need for fragile items?
Should I use wooden crates or cardboard boxes for export?
How do I prevent moisture damage in a shipping container?
What are the standard shipping labels I must apply?
Why SIS
Protect Your Cargo with Super International Shipping's Export Packaging Expertise
From carton selection to container lashing, Super International Shipping ensures your cargo is packed, wrapped, and stowed to survive any voyage.
- ✓On-Site Packing Supervision in ChinaOur loading teams verify carton strength, cushioning, and pallet stability at the factory before containers are sealed.
- ✓Export-Grade Packing Materials SupplyCorrugated cartons, VCI film, desiccants, corner boards, and shrink-wrap sourced at competitive prices.
- ✓Container Stowage & Lashing ServicesProfessional loading plans, dunnage, and air-bag lashing that prevent in-transit damage.
- ✓Damage Reduction & Claims SupportMeticulous photos, packing lists, and weight records that protect you if a carrier claim becomes necessary.