Haven't had a chance to try them out yet, but I just picked up one (a set?) of these to tuck into my day-pack (inspired by this thread and J. Baker's review of a similar product). 15" long and 8 oz. By leaving the legs closed it can go from a 12" to 14" bipod on up to a stool/kneeling height of 36" to 39". In between, with two leg sections locked, it is about right (26 to 28" +/- depending how far the legs are spread) for sitting on the ground.

https://www.primos.com/primos-huntin...24/c-114/p-397