Personally I either use a full vinyl for high key, or a Hilite for 3/4 length shots.
Although I'm very happy to be shown otherwise, I can't think of anything else. You either use something that lays totally flat like a vinyl, or you use something that's easily transportable like a bed sheet, but accept that you'll have a lots of PP work to do.
On the floor the PP isn't too bad, but the join with the Hilite can be a royal pain.