I used to have the darkroom in one of my bedroom and I used the large plastic bag that came with the printing plate material. They are light proof and I attached them to the windows with velco. The curtain would cover them up so from the inside the room look fine. From outside of the house people often wonder what the heck I was doing. I do RA-4 drum processing so it's purely dry darkroom. I would take the loaded drum to the bathroom and process the print.