I recently used the "as seen on TV" screen door that closes with magnets in the middle on a recent 10-day trip. Attached it to the door frame with strong magnets that have ring style clasps. It took a few tries to figure out how to attach it from the inside so we didn't have to move it every time we closed the door. It's not wide enough to open the door behind the sink, so that one stays closed. It's too long too, so I just cut it shorter so we wouldn't trip on it. The trick seems to be to use several magnets in the center at the top so the closure magnets work. Not perfect, but VERY easy and folds up small for storage.