When a backpack is too bulky for that quick lap but your pockets just won't do the job, the Stash Quick Rip 1.5L Pack from Race Face is the perfect solution. It packs water, nutrition and spares and it won't get in your way. Also, the two lower straps are perfect for carrying knee pads or a jacket. When not in use, the hooks can be stashed away.
||Ripstop nylon / 3D mesh backing / stretch belt