My G11 has been outside since I got it. Check out the scope and tripod covers from telegizmos 365 range.
I leave everything out there hooked up, cameras, scopes, the lot. Haven't had a single issue.
You'll need the tripod cover as well as a scope cover. My tripod cover never comes off and I leave all my power supplies underneath. They have been bone dry for about the last 8 months. Couldn't be happier with them.
http://www.telegizmos.com/365%20size...20page%202.htm
Cheers