The Nallo 3 GT vestibule, unless you have it cracked wide open or use it in a super dry climate, is a recipe for a rain forest type condensation event. I got the non-GT Nallo for that reason- you can stack a couple backpacks in it and your boots/stove, etc but it's definitely not a big vestibule, but I don't mind it much. I usually have a client stick his pack in the vestibule and leave mine outside with my rain cover on it.
The Big Agnes Fly Creek vestibule might as well not even be there. It's big enough for your boots and whiskey bottle... and maybe a stove.
