Our material is rated 200 lb Mullen/32 ECT.
The materials we use to create your custom box are rated to carry up to 50 lbs of materials.  If the contents of your box are over 50 lbs we would recommend a double wall or triple wall constructed box.

Currently we don't offer double/triple wall boxes.  We would recommend contacting a box manufacturer in your city/state to inquire about their availability. 

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