Abstract: A jacket holder for holding a jacket wherein strips of microfilm are inserted into pockets formed in the jacket. The jacket holder comprises first and second plate members hinged with each other for holding the jacket therebetween. The first plate member includes a raised inclined surface portion at its one end portion with film strip inserting passageways formed beneath the raised portion and the second member includes a recessed inclined surface portion complementary to the raised portion. By means of the cooperating raised and recessed portions, the jacket held by the two members is bent at the portion where inlets for the pockets exist so that a film strip is easily inserted into the pocket through the passageway and the inlet. A system is also disclosed for automatically inserting film strips into the jacket pockets.