• Paterson Changing Bag is one of the most essential pieces of equipment when developing film at home. Also, one of the most simple. You can load your film into a developing tank without the need to find a darkroom. It has a fail-safe double skin with zip and velcro closures and the inner lining is specially designed to avoid perspiration in prolonged use. Additionally, if you have a change bag to hand it will mean you can safely remove any film that you jam or partly expose from the camera.