I carry one of these sometimes, too. HS Strut seat with folding legs. The peg les will sink into soft ground up to the horizontal tubes between the legs then it will stabilize. The factory strap is jut plain akward and I ct mine off and replaced it with a piece of nylon rope.
https://www.hsstrut.com/product/strut-seat/Last year I bought one of these that was on sale for cheap. It's a little heavy but it's very comfortable.
https://www.amazon.com/ALPS-OutdoorZ-Vanish-Chair/dp/B0B72GBWHX
