This is the most effective protection you can buy for shielding your film from fogging by airport security x-rays. Holds 45 unboxed canisters of film or 50 rolls without canisters, or 16 boxed rolls of 120/220. It can also hold four 10-sheet boxes of 4x5 film. Measures 9.5 x 12.25" and weighs 15 oz.