Thanks everyone. I really need it to be waterproof for my commute, guess I will check out some alternatives. Every Spring the college where I work has a large concert, and loading a pack with ice and beer is much nicer than carrying a cooler full of ice/beer the three mile walk it takes to get there (I've done that way too many times, been using regular pack with several garbage bags as a liners). So that is why the ice question. More concerned with bike commute aspect of it.