Okay for you bivy lovers. I am looking for a waterproof bivy for under my Kifaru Tarp. I used a lightweight breathable from Ti goat this year and want to upgrade to a a full on waterproof one now. The two I am looking at are the big agnes 3 wire bivy and ID buga boo bivy? Which should I get? I want to be able to bivy out from camp if need be without the tarp.