Why deal with a full-blown daypack when you're just scooting across town on your bike to run a few errands' The Patagonia Atom carries your keys, wallet, a light jacket, and a headlamp just in case you run into a buddy and wind up yapping until dark. The beauty of the Atom is that you can just spin it around in front of you for access, instead of having to unbuckle a bunch of straps to take it all the way off. The Atom also comes with internal mesh divider pockets to keep everything organized.