The cooler backpack is full size, approximately 14" x 6" x 12" and can hold up to 30 cans! Depending on use, fullness, amount of ice & drinks, insulation time can be anywhere from 10-12 hours.  Inside the backpack there is PVEA thermal insulation material. With the action of the insulation layer and using your desired amount of ice, it achieves the effect of keeping the low temperature of the items. Suggested Retail Price: $40.00 each Not only are they great during the summer months of traveling and river or beach trips, but they are also great in the spring and fall for all those hiking trips!