When we hear fanny pack, we picture tourists with flip-up sunglasses, prancing around amusement parks. Make no mistake: the Monster is not for prancing. And unlike fanny packs that suffer from the droops, the Monster's adjustable suspension keeps everything in place. With 1,100 cubic inches of storage, seven pockets, and a Delron Flex Frame, the Monsters got as much built-in engineering as our biggest packs. Hydration compatible.