These are constructed of the highest quality materials on the market; half-inch closed cell foam, vinyl coated polyester and YKK zippers. They will hold ice for as long as needed due to the closed cell foam. They are equal to approximately 70 qts and have three handles for easy carrying. They come with three d-rings on each side for tying down to the kayak and the top has an adjustable cord for storage of gear. The dimensions are 36 inches long, 8 inches tall, and tapers from 10 inches wide to 20 inches wide.