Disc Chartpak Storage Tube Large 4" Extension Black 12" Long

Chartpak Storage tubes are versatile, air-tight, waterproof, inert polypropylene tubes for storing or mailing documents. To create a tube, select a top and a bottom in a given diameter and add as many center pieces as necessary to fit your needs. Pieces are sold separately. Handy Chartpak carrying straps are also available."