{"id":4236,"date":"2026-10-31T16:15:21","date_gmt":"2026-10-31T16:15:21","guid":{"rendered":"https:\/\/tadapack.com\/news\/5-cu-ft-box-how-many-kg-fit-load-cube-teardown\/"},"modified":"2026-10-31T16:15:21","modified_gmt":"2026-10-31T16:15:21","slug":"5-cu-ft-box-how-many-kg-fit-load-cube-teardown","status":"publish","type":"post","link":"https:\/\/tadapack.com\/news\/5-cu-ft-box-how-many-kg-fit-load-cube-teardown\/","title":{"rendered":"5 Cu Ft Box: How Many KG Fit? [Load & Cube Teardown]"},"content":{"rendered":"
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\u3010TL;DR Executive Direct Answer\u3011<\/strong><\/p>\n

A 5 cu ft box (roughly 460 \u00d7 460 \u00d7 410 mm) can safely carry 18\u201332 kg depending on board grade: ECT-32 single-wall supports ~20 kg payloads at a 4:1 safety factor, while ECT-44 double-wall (BC flute) pushes safe payload to ~30\u201332 kg in stacked distribution. Cube utilization \u2014 not board strength \u2014 is usually the binding constraint: keep actual density below 90 kg\/m\u00b3 of internal volume to stay compliant with ISTA 3A stack conditioning.<\/p>\n<\/div>\n

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Figure: Packaging Design Overview (5 Cu Ft Box: How Many KG Fit? [Load & Cube Teardown])<\/figcaption><\/figure>\n

1. Cube Physics First: Internal Volume, Void Space, and Practical Payload Ceiling<\/h2>\n

A nominal “5 cubic foot” box does not hold 5 ft\u00b3 of product. The 5 cu ft figure typically refers to gross external cube of a mid-range RSC around 460 \u00d7 460 \u00d7 410 mm external (approximately 0.087 m\u00b3). After subtracting wall caliper (single-wall C-flute \u2248 4.0 mm per face), internal usable volume drops to roughly 0.080\u20130.083 m\u00b3. Apply a realistic cube-utilization factor of 85\u201392% (product + void fill + dunnage) and the net payload envelope lands near 0.072 m\u00b3.<\/p>\n

Translating this into kilograms requires a density ceiling, not a weight ceiling. For consolidated corrugated shipping containers, structural engineering practice keeps loaded density at or below ~90 kg\/m\u00b3 for single-wall and ~140 kg\/m\u00b3 for double-wall constructions when containers are palletized and stacked. Applied to 0.072 m\u00b3 of net envelope, this yields the practical payload bands used throughout this guide: 14\u201320 kg (single-wall ECT-32) and 22\u201332 kg (double-wall ECT-44\/ECT-48). Exceeding these densities shifts failure mode from compression to flap bursting, seam delamination, and bottom blowout \u2014 all non-compliant outcomes under ISTA 3A General Simulation Performance Testing.<\/p>\n