A good quality, Cordura nylon duffel bag will provide
more than 11,000 cubic inches of water-resistant
storage space:
http://www.vanthology.com/1Layout/Gallery/GN6.html

With only one large compartment, it can accommodate
everything from hiking boots to bulky camping chairs
and screen tents. It compresses down to the size of
its load to reduce wind drag, and folds up completely
when not in use. For complete waterproofness, it can
be thoroughly sealed on the interior, or can be
double-bagged with heavy-duty trash bags.

Available here for significantly less money than
either of the previously mentioned options.

http://www.rei.com/online/store/ProductDisplay?storeId=8000&catalogId=40000008000&productId=10454437&parent_category_rn=4501703

Jeffrey Earl
1983 diesel Westfalia "Vanasazi"
http://www.vanthology.com/

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