This product is specifically designed to hold snap-cap style samples and insulate them and regulate the temperature for 6+ hours in a lab environment. It is compatible with 1 oz, 2oz, and 3oz snap-cap sample containers. It has been tested with glass vials and also maintained good temperature regulation results.

It could easily be scaled to work with cans or other things you would like to keep cold.

This file has spots designed for magnets to be placed on the lid and core to fit smoothly together. This is optional, but recommended. 

B-CA008 x 4 round magnets. 

Ziplock bags with water to fill in-between the sample ports and then just keeping in the freezer worked remarkably well for me. 

This was made in 1.75 PLA with a 0.4 nozzle.