The Kaiser Changing Bag is the ideal tool for working with light-sensitive material like film. It enables you to to open the camera back without damaging the film. For example when the film wasn't spooled correctly and is jammed in the camera. Many analog photographers also use a changing bag for film development when no darkroom is available. The changing bag allows you to spool 35mm and due to its large size even 120 film easily onto any film reel.
The changing bag is made of a special black light-proof fabric with rubber lining. It's also infrared light-proof and has two hand holes with a light-proof zipper.