A clamshell-style box manufactured from your choice of .065 MicroChamber or .065 Micro-Chamber/Silversafe boards holds an inner unit manufactured from the same paper in corrugated form. Notches cut into this corrugated frame allow a full support bar to provide correct storage in boxes which are not completely filled. This design permits the box to house collections stored in polyester sleeves, in conventional negative envelopes, or in four-flap enclosures. This item is available as both a 4 x 5 storage system and a 5 x 7 storage system. These boxes will hold material 10-1/2 inches of either 4-3/8 x 5-3/8 or 5-3/8 x 7-3/8 photographic negatives, transparencies, or prints. Consider the thickness of any enclosures when calculating capacity.