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The Stack Math: How to Load Totes Safely
Stack ratings on IBCs are written in a vocabulary that obscures what they actually mean. Here is the translation, with worked examples for both 275 and 330 gallon formats.
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What the rating tells you
A typical 275-gallon IBC carries a stack rating around 5,000 lbs. That is the load the cage and bottle, sitting on the ground, can support on top of itself when full. It does not promise indefinite duration, ambient temperature variance, or off-center loading.
In practice, two-high stacking of full 275s (about 2,430 lbs per tank) is well within rated limits. Three-high of full units is not.
For 330s, do not assume
Many 330 cages are rated for single-tier stacking only when full. The taller bottle profile changes the failure mode. If your warehouse SOP says "always two-high" without distinguishing format, you may be operating outside spec for half your inventory.
Empty tanks
Empty IBCs can be stacked considerably higher — three or four high is typical and well within the cage rating. The risk in empty stacking is wind and forklift contact, not vertical load.
Continue reading
- ← Older: Shipping 275 vs. 330: The Truckload Numbers (February 14, 2024)
- → Newer: Food-Grade IBC Tote Buyer's Guide (April 15, 2024)