I have a drying rack that folds up. I used it while camping and at times when I was between housing. I put two coat hooks on the side of my camper, and the drying rack would hang from them. It was handy to hang towels or wet clothes from.
I still have it, and it will hold about ten bras. I usually do laundry often enough that I don't need the rack. Any doorknob will work. 😂