Filson's roll top bag. I've had it for around six years. The twill has broken in nicely and has handled admirably even in downpours without so much as getting anything wet inside. :
Filson Dry Backpack 20067743-Green keeps your gear dry in any weather
FILSON "ROLL TOP BACKPACK" | relief
Filson Roll Top Backpack - Moosejaw
Filson Roll-Top Backpack, One Size, Tan 11070388TAN - Adorama
Filson Roll Top Backpack Otter Green (BRAND NEW) This roomy backpack has a snap-closure top that rolls down to kee… | Filson bag backpacks, Top backpacks, Backpacks
Filson Roll-Top Backpack | Tan | 11070388 | Stuarts London