A dunnage bag is not better the harder you pump it. Too much dunnage bag inflation pressure can burst the bag or even crush the cartons beside it; too little and it cannot hold the cargo — no securing at all. Get the pressure and method right and the bag performs at its best.

1. What Is the Normal Inflation Pressure?

Standard container dunnage bags generally work at 0.2–0.3 bar — check the bag size and manufacturer guidance. Judge by feel: the bag is full and firm, springs back when pressed, and the cargo on both sides is braced tight without wobble. A pump with a pressure gauge keeps batch work consistent.

2. What Are the Dangers of Overpressure?

Over-inflation can burst the inner bag or split the outer seams — worse, it can deform the cartons on either side. For high-value, fragile cargo, better to run slightly lower pressure with an extra bag than to pump one bag to its limit.

3. Dunnage Bag Usage Notes

• Bag first, inflate second: position the uninflated bag, then inflate — do not inflate first and force it in.
• Avoid sharp objects: keep clear of pallet nails and metal burrs; slip cardboard in between where needed.
• Valve facing out: point the inflation valve toward the accessible side; confirm it locks after inflating.
• Do not over-pressurize: follow the manufacturer’s recommended pressure; stop immediately if the bag makes unusual sounds.
• Deflate before unloading: release air through the valve before removing the bag; kraft paper models can be folded and stored for reuse.

4. Can Dunnage Bags Be Reused?

Kraft-paper composite dunnage bags can be reused 2 to 4 times if they were not abraded or punctured in use and conditions allow; PP woven models are mainly single-use. Before reuse, inspect the outer bag for damage and check the valve is intact.

Tezheng’s dunnage bags use PA/PE co-extruded inner films for excellent air retention — no pressure loss on long ocean voyages. Large-valve models inflate faster and save labor when paired with the right pump. Any questions about how to use dunnage bags, feel free to ask.