Hennessy Hammock. I have the Expedition Asym. They just started letting retailers carry it, so it is a little cheaper than when you had to buy it direct. It is $140 on their site, you can find it on Amazon for about $100.

I love this thing. Way lighter and way more comfortable than a tent. The only problem I have had with it is having to kick other Marines out of it when I return from a night patrol.