How about a large cardboard box? You could fold it flat during the day and put it behind a door or up against a wall.Erecting bin bags and taking them down daily was a pain because I had to block out the windows too. I had to blacken my bedroom door to prevent light leaks and I couldn't move around the place without a torch at night. I don't really want to live like that again!
I am not a very handy person and don't have tools. I need a design that I can give to someone to make for me.