It’s important for hampers to have ventilation. The example below shows one you can hang over your door. I have 2 of these. I think my brand was Sunbeam(?), but Amazon has it listed under Pro-Mart. For some reason, the image here shows a pinkish back that resembles fleece, but I think it’s just a weird image flaw. There’s no pink back on mine – it’s the same vented mesh all over. I got mine at a local hardware store. These are identical to those pop-up hampers, but with a flatter back and a strap for hanging.
Laundry hampers with ventilation