Not sure how big you need but just get you some concrete blocks and set them side by side. Then put your stuff on top of the blocks. I'd use haydike (sp) blocks for height....DT

Home Depot has some large, molded plastic, storage boxes that were $99. If you don't want to spend that much, check out the LARGE size coolers, they are $30 ++.

You also might give a look at Rubbermaid's website. They have a lot of outdoor storage solutions, but they're also kind of pricey.

Run by some of the bigbox stores and ask them for a few of their wooden pallets. They get things off the ground and you can probaly get them free.

Pallets and a tarp.......$20.00.......Done!

There's another outfit (Shelter Logic) that sells tarp sheds. I bought a 6X6'three years ago for $99.

I use pallets for keeping bags off the ground - but there are different grades and sizes. I buy 4-foot square pallets that are made of oak - which means that they are big and heavy. I set them up on bricks so that they don't lie directly on wet ground. I get them at a pallet supplier, who sells mainly to truckers and businesses - try "pallets" in the yellow pages. Seems like I paid $6 each the last time I bought them.