A device for protectively storing collectible disks, in particular a plastic album leaf for protectively storing and displaying collectible disks such as milk caps or coins. The device comprises two flexible plastic panels in superposed relation, and securing means securing the panels in such relation with a first opening between the panels, the securing means including an arcuate seam sealing the superposed panels together along a circular arc for containing at least one-half but not the entirety of the disk between the panels within the arc of the seam, the arc of the seam exceeding 180.degree. and terminating at a second opening between the superposed panels of sufficient width for permitting passage therethrough and into the arc of at least one-half of the disk when the disk is received by the first opening for containing the entirety of the disk between the panels.