Pacific Outdoor Equipment Crank Backpack
Here's what other sites are saying:
Wider and deeper than some of Pacific Outdoor Equipment's other bike commuting packs, the tough Crank Backpack has internal pockets and a large flap-top opening to make it easy to haul it all. Stash a day's worth of books, a spare layer, and a lunch inside this pack and hit the pavement. Padded shoulder straps take the bite out of a particularly heavy load, and a reflective stripe down the pack helps you stay visible in traffic at dusk.