How to Test Compression and Stacking Strength in Packaging
Test your boxes for stacking and compression before they fail in the warehouse.
Practical tests
Testing methods0 / 4 checked
Quick answer
Stack packed boxes to your intended height and leave for 24 hours. If the bottom box shows compression, the board grade is too weak. Test in your actual warehouse conditions including humidity and temperature. A quality single wall box stacked 3 high with typical loads should show no visible compression after 24 hours. If it fails, upgrade to a heavier board grade or double wall for the bottom layers.
Interpreting results
Upgrade board grade or reduce stack height.
Larger boxes or heavier board needed.
Consider moisture-resistant treatment or double wall.
Grades: grading or weight limits.
Improving stacking strength
Heavier board grade, tighter flute spacing, and correct box orientation all improve compression strength. Stacking with edges aligned (not offset) distributes weight through the strongest structural lines. Keeping boxes dry is critical: moisture reduces strength by 30-50%.
Strong stacking boxes
Compression-tested boxes from ProcuraPack.
Browse single wall boxesFrequently asked questions
Pack and stack to intended height. Leave 24 hours. Check for compression.
Visible compression, bulging sides, or collapse.
Typically 3-4 boxes with standard loads. Test for your specific conditions.
Significantly. Damp boxes lose 30-50% of compression strength.
Heavier board grade, edge-aligned stacking, and dry storage.
Part of our guide
Product Guide: Single Wall Cardboard Boxes
Expert guides on single wall cardboard boxes for shipping, storage, and e-commerce packaging.
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