Originally Posted by peripatetic
Update: Just went out for a ride, used the stabilizer strap (yes, the large Patagonia ones have 'em). Still slid down, though not as much. I'm thinking I'm just too skinny for the damn thing. Next option: an Ortlieb that I just bought off of a friend. Thing is, thing says "MESSENGER" in big letters on the back, and as I'm NOT one, nor wish to portray one in public, I feel veeeeeeeery poseur-esque even using it. All I know is, my North Face backpack just isn't cutting it--too small. erg.
make sure the bag's actually up high across your shoulders, not hanging across your lower back...