>>1812082It depends on how many people, what type of shelter you build, how much space you want, and the weather. I'd start with the 7'4"x9'6"for 1 person spring through fall and the 8'4"x11'6" one for 2-3 people in the spring through fall. If it's winter you'll probably want a slightly larger tarp, but I don't have any experience with that. I'm a poorfag so I've only used the HF ones, other companies sell symmetrical tarps.