I like to be high enough to be comfortable on the top board of a 2-board stack, so this is my stool of choice: Gibraltar GGS10T drum throne . I love how easily it folds up for carrying around.

Their description is a bit misleading --- 27" is not the height of the stool but rather the length of the center post (not very useful information for anyone but the manufacturer). The actual height of the stool is 30", so it took some work with a hacksaw to bring it down to a useable height. (They do also list what they call a 21" stool --- which probably means it's a reasonable 24" high to begin with.)

- Jimbo