The Mountainsmith Frostbite 20L Cooler Pack is ingeniously designed with a bottom cooler that fits a six pack of your favorite frosty beverages, alongside a traditional rucksack on top for carrying all your stuff to the campsite, local pool, or beach. The insulated lower cooler keeps beverages icy-cold for up to 12 hours, so you won't have to constantly refill it with ice on those hot summer days. It even has a smaller top lid pocket, so you can quickly find your cash, phone, and keys when you leave the beach for some local grub down the street.