Printfile 35mm Negative Storage Pages are clear sleeves to store your film. 35-7BXW hold seven 35mm strips of 6 frames, that is 42 frames in total. Negative storage pages, or negative sleeves, are vital for keeping film clean and safe after they have been developed. As well as keeping you organise your negatives, they protect the film from dust and scratches when they’re being stored in a Negative Storage Box.