Before it morphs into a backpack, the FreeRain24 is no bigger than a coffee cup. Unfurl the tiny bundle from its attached stuff sack, and you have an instantaneous do-it-all backpack — one that is totally waterproof (roll-top closure), ridiculously lightweight (5.5 ounces) and puncture resistant (Cordura nylon.) Ideal for spontaneous travelers and summit bidders.