The Ilfordlab Prepaid Film Developing Mailer is great for trips! Just stock up on a few and drop in the mail while still on holiday. It processes all types of 35mm and 120 Black and White film, including non-ILFORD films and color process black and white films. The film processors are strictly controlled and the black and white machines use ILFORD chemistry throughout. Each film is processed with a unique development time to obtain optimum contrast and density.