"You can find these things at Walmart, they look like the other more pricey variety dry bags. I believe you can get a set of 3 for around $10.00. I was a bit skeptical of their ability to keep water out, so I stuffed one full of clothing and sprayed it for several minutes with the kitchen facuet sprayer. When I took my clothes out they were dry.
Other people I know have used them on several backpacking trips as food bags and their food stayed dry despite rain and they\'ve used them as stuff sacks for their down sleeping bags.
I'll give these a four because I can't speak to durability yet."