>>780667The bivy is all around waterproof and the stated weight is correct.
I'm 183cm tall and I fit the bivy just fine. Fitting your backpack in there as well might be a problem.
>>780709Yes there are hooped bivy bags. Mine can be set up like in the pic (just tying some rope over a branch).
>>780733Might have been overly exaggerated, but the space in my tarptent is certainly not enough to sit comfortably or move around alot. Yes I can pack my bag in there but it's nowhere near as spacious as a tarp.