Box or Cooler

It’s both!

Dogfish Head has a new Off-Center Your Summer Pack. It has water-resistant packaging that allows you to convert into a cooler simply by tossing ice in. The variety includes 60 Minute IPA, SeaQuench Ale, Lupu-Luau IPA and Namaste White. 3 of each.

I wonder what these are made from or coated with to keep them stable?