http://www.seattlesportsco.com/productcart/pc/viewPrd.asp?idproduct=33&idcategory=11
I swear by my seattle sports dry bags. They've stayed completely dry inside even when I've capsized my canoe. I take a small one backpacking so I can keep my clothes dry and it works great as a pillow too. I don't know if sierra trading still has them (its been almost 10 years since I got mine) but they used to sell the cosmetically defective ones at a pretty good discount.