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I regret buying my bivvy. Its high quality, waterproof, has hoop features and bugnets. I was like you OP and bivvys seemed really cool, but they are actually a fucking annoyance. Within the first 3 days of using it I had wished I brought a 1 man tent instead. There is no room to do anything. Good luck trying to unpack/move around in there when its raining. It takes up the same space a small tent would and weighs about the same too.
Dont take the bivy-pill just get a small tent or a tarp. The cool factor wears off as soon as you actually have to use it in anything but sunny weather