Quite tall (as indicated on product dimensions- not a surprise) and seems rather sturdy. My 11 year-old son and I put it together quickly. It does help to have a 2nd set of hands during assembly. At first, we couldn’t get the wheels to stay, but then we realized that need a good shove to click in to the bottom of the frame. Two of the wheels have locks on them also. This frame is meant to stay open. It doesn’t fold away.