Integral Designs SilBothy
Here's what other sites are saying:
The Integral SilBothy Emergency Shelter is so light that you'll have to double-check your pack to make sure it's there. When Mother Nature sneaks up on you and your companion, duck under this silicone-impregnated nylon ripstop shelter and plop down on waterproof seats to wait out the storm. A built-in stuff sack further helps save weight and add efficiency, and air vents help reduce condensation and provide air flow.