Jeff is a former resident from the Selkirk I nstitution. He walked off. That is a 75 litre pack I bought from Mountain Equipment Co-op, and out doors store. Like a high end REM store. Their stuff is quite pricey but great quality. I rode year round to and from work from 06 to 2012 with that pack for the last 4 or 5 years. My pants, shirts and Ties never got wet in there. Not once. We getmore rain than Seattle so you can imagine the shit I rode in. The salesman fitted that to me and quite honestly, when on the bike and riding, I would not even know I was wearing it. I imagine if I went down at any speed, that may make injuries worse though. I still use that pack now that I have taken up hiking. Its a hell of a lot heavier climbing rocks with that thing loaded and on to be sure.