MSR E-Wing.
I have the E-Tent in my emergency kit.

I'm not kidding when I say it packs up smaller than a beer can. Weighs about a pound and deploys in seconds.

Here's a pic of my E-Tent set up at Fish Lake in Eastern WA last summer. [img][image]http://img121.imageshack.us/img121/3017/fishlake018.jpg[/img][/image]