SealLine EcoSee Clear Dry Bag
Waterproof bag fits in a backpack
I have never found a fully waterproof backpack that had the fit and features of more general purpose non-waterproof backpacks. So I ended up getting this clear SeaLine dry bag to slip inside my backpack. I got the clear one because I thought I would pull it out of my pack but I find I rarely do that. I use it more like an internal liner or sleeve inside my backpack. Another benefit of this is I also use it inside my commuter bike bag when pedaling to work in the rain.
04/22/15SealLine EcoSee Clear Dry Bag $20 - $100, depending on size