Originally Posted by GeneO

I am partial to my Mission Workshop. Waterproof, very lightweight, quality workmanship, made in USA and lifetime warranty. I have the VX Sanction. Fits my needs in size for my 33 mi RT commute. Only cons are it is a bit pricey, and doesn't have a loop for a taillight.

http://missionworkshop.com/products/...x-rucksack.php

Disclaimer: I don't mind my back getting sweaty and I have a shower at work.