best cool bag rucksack

This waterproof cooler Backpack is constructed by 840D nylon TPU to make sure it is 100% waterproof. 

The high-density insulation material and leak-proof liner can keep your fruit fresh and your drinks cool for 3 days with the assistant of IPX7 airtight seal zipper.

This cooler backpack is 30 Liters with double padded shoulder straps. People can carry it comfortably.

It also has webbing loops that means people can take it when they are biking or motorcycling as it can be fastened on the bike or motorcycle through the webbing loops.