Depending on how much weight you want to put into it, you might think about an automotive trunk organizer net. I have a several OEM Ford Minivan "envelope style" cargo nets that I got at a garage sale
; they're stretchy, hold a lot of stuff, and have loops in the corners so they can be mounted in any area you want. I put fenders, spare docklines, life vests and storm sails
in them, and they keep them reasonably organized and mildew-free. I'm rather appalled at what they want for them new, $51.75! http://www.fordaccessoriesstore.com/fas/b2c/catalog.asp
Type "Cargo Net" in the search field.
I'm sure such a thing is available after-market, for example this flat style at JC Whitney's is only 16 bucks: http://www.jcwhitney.com/autoparts/P...001425/c-10101
Another source might be camping stores. Here's one at REI with carabiners in the corners for $20: http://www.rei.com/online/store/Prod...cat=REI_SEARCH
I've seen cheap
hammocks at Army-Navy stores too, couple bucks apiece.