The Titan 48 can zipper less cooler still has ice after 3 days! deepfreeze high performance insulation with Radiant heat barrier and a triple layer cold block base combine to create superior cooling. There is a "flip-open" patented zipper less lid that provides quick access to food and drinks and an insulated front pocket. The Rhino-Tech exterior is tough stain and water resistant and Wipes clean easily. The interior features a durable Hard Body liner with Smart Shelf. The Smart Shelf allows you to keep hard stuff like drinks separate from soft stuff so sandwiches and other soft foods don't get crushed. If you want to use the entire liner the Smart Shelf easily removes to provide one large compartment. Designed for convenience and usability this cooler also features an adjustable back saver shoulder strap with shoulder pad that centers load weight to reduce muscle stress.