Changing bag
A changing bag is a photographic bag specifically designed to be light-proof and therefore to protect the light sensitive film before intended use. A changing bag is made of light proof material, and usually is composed of synthetic fibre. They are convenient to use when a darkroom is not available, as when in the field. Many photographers do not own or have access to a darkroom, yet still need to being able to protect film from light, as when removing film from its canister to put it into a developing tank, or loading and unloading sheet film holders. They are also commonly found on the set of a film, where the clapper loader may need one if shooting on location or far away from a darkroom.Usage
A changing bag is routinely used by amateur photographers and others when a darkroom is not available as is often the case in field shooting. It is also used in commercial photo processing labs, often to change paper.Description
A changing bag has two sleeves at one end for both the user's arms, and a zipper to insert the tools and film needed. There are several sizes available, from smaller ones for many still photography applications to larger bags used in large-format still photography or film making, which may need to hold both a magazine and a can of film stock which each have a 1000-foot capacity. Larger changing bag sizes are also available as "changing tents", where the top of the bag can be held in a dome-like configuration through the use of two curved rods.