Gotta break away from the pack on this one. What you want is a bag that has a lot of room, easy access, and is absolutely waterproof. The Motofizz gives you two out of three. After trying and abandoning other options, I finally found the Dry Pak waterproof duffel.
Here's one source; it comes in several sizes. I have the extra large, and it holds ALL my camping gear: tent, poles, sleeping bag and pad, cook gear, plus spare shoes, etc. Everything. It's so waterproof it's literally submersible.
The material is a very tough rubberized-feeling fabric (the web site says polyester/vinyl) that rolls up two or three turns for a complete seal. In fact, if the bag is less than stuffed, just roll it up tighter to make it less bulky. You can draw it up tight with four straps on the ends and over the top. The thing I've found I like best about it is at night I put all my riding gear in it--jacket, helmet, boots, etc, (even my really bulky Cycle Port jacket and pants) and seal it back up, and just leave it outside the tent. Camping on the foggy coast when you wake up and everything's soaked, or even if it rains (I do try to avoid that), everything inside is totally dry, and there's all that extra room in the tent. The opening is huge for easy packing and removal. It isn't easy to get stuff into or out of while on the road, though. That's why it's for my camping gear--stuff I don't need till I stop for the night.
Once it's strapped down on the back seat (definitely Rok Straps), it makes a great back rest too. Oh, and it cost me about
fifty bucks!
