Topeak Freeloader Bag
Topeak are acclaimed manufacturers of practically every bicycle accessory you could think of, with a vast range of tools and maintenance items, panniers, racks and saddle bags, lights, fenders, saddles, plus much more. The quality of their build materials is second to none and everything is designed to withstand the elements and live through extended use.
A handy, on-the-go stem bag stores munchies, a phone, small camera, extra bottle or anything else you need to keep close at hand. An additional mesh side pocket provides more space for smaller items.