Mesh bags. Mesh and clothes basket when grandkids are with us. We typically travel to visit other places (don't stay in a cg for less than a few days before moving on). Occasionally, we will stay a week - two weeks in the same cg. Rarely do we stay in a public cg, but the past two days we have because we wanted to take the train up to the Grand Canyon from Williams Az. When we do stay "local" to home for any 3days to 2 weeks, we go to a membership cg about an hour away.
When traveling without grandkids, Don and I have a mesh bag that we deposit our dirty clothes into. We store it on the top bunk in the back. We usually travel w/7 days of clothing (more if we have to bring both hot/cold weather clothes). When bag is full, we grab it any towels/kitchen towels and head to the laundry.
When traveling w/older two grandkids as we are for four weeks currently, we use the mesh, while the girls use the basket. The "hamper" is stored back on the side of the lower bunk that Jenna isn't using to sleep on. Works for now and because we only take the older two kids with us right now. When basket is full, we head out to do the laundry