The original AO canvas 36 pack has been in the cooler game for over 30 years. The canvas cooler has been a staple for the AO brand with good reason. Their canvas cooler's exterior is made up of 600 denier polyester canvas, with a heavy duty backing for exterior strength, and a Scotchguard topcoat for UV protection. Insulated with ¾” thick polyurethane high density closed cell foam, which makes it hard for air to be blown through and lined with a leak proof, eco-friendly welded TPU liner that has physical strength and elasticity making it abrasion resistant. The 36 pack is another popular size, great to use for boating, family day trips, camping, and as a food storage bag.