Bum bag: The North Face MOUNTAIN LUMBAR PACK is the perfect choice if you don't want to carry a backpack but need to take your essentials with you. It has a large inner zipper pocket for things like a phone, a small bottle, a wallet or keys and a hidden zipper pocket for even smaller items. Inside there is an organiser with a zipper pocket, an elasticated mesh pocket, a key hook and pen loops. If you don't fill it up, you can simply tighten it with a carabiner rope.