Timbuk 2 used to have a nice one but I feel that is long gone. It's and a little deeper and not as wide as the chome or Seagull....more like the Reload. Regardless I have worn a hip pack riding in Yokohama and it's large enough for a wallet, keys, and a either a normal paperback boo or the larger trade paperbacks along with an Ipod. I've also used it with my motorcycle leathers on long cross country trips to keep a few things accessible. In general the more you stuff into it the less comfortable it's gonna be when you sit down on anything but a bike seat