Quote Originally Posted by tulip
The bigger the bag, the more stuff you WILL put in it, and the heavier it will be. If you have alot of stuff to lug about, I recommend panniers to keep the weight low and off your back.
Which is why I think I'll go with the small. I don't lug a bunch of stuff to and from work, so all I'll be taking are pants, shirt, undies. I've gotten pretty good at rolling that stuff into tiny packages.