If you're traveling somewhere where it rains a lot (AKA the Pacific Northwest), then you should check out the DaKine Crew Duffle 67L Duffel Bag. With it's 600D Waterprrof PU Polyester your stuff will be able to stay dry even in the wettest conditions.
600D Waterproof PU Polyester
YKK waterproof zippered side and end pockets
U-shaped opening for easy access
Padded shoulder strap
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Comments about DaKine Crew 67L Duffel Bag:
It is perfect if you don't want to take one of your nicer bags. I use it out in the woods and don't mind it getting wet. this is very spacious and fits everything I need when on the go.