http://www.timbuk2.com/tb2/products/...ke-backpack-v1

best investment ever.

I have panniers, and a trunk even. But that bag goes with me everywhere. I carry my mp3 player, sweater, extra anything in it and have NO issues.

I've used Timbuk2 messenger bags too, and I demoted it after 3 weeks to my 8 year old. He loves it for his second grade stuff.