Drop front opening paper storage boxes are great for archival storage of prints, photos, music sheets, pamphlets, and letters. Extra strong with metal edge. Constructed in the UK. - Preservation Equipment Ltd
Archival Storage File Boxes - 15 x 12 x 10" S-15180 - Uline
University Products Archival Photo Envelopes | The Container Store
How to save money by making your own archival boxes | Things I'm Fonds Of