The function of the device is to defer external heat from the interior of the device in order to maintain an acceptable temperature. Contents stored in device will need to be protected from outside loadings and impacts.  

(sub-zero)^3. There is no SUB-stitute for ZERO need to replace your ice every day or week to preserve your perishables in the backcountry.

(sub-zero)^3 provides outdoor enthusiasts with the “Cubic Protection”; Durable, Functional & Super-insulating.