These unbuffered, inert boxes are ideal for the proper preservation of blueprints. 3" x 3" x 36" - Inert Polypropylene Blueprint storage Tube $8.95, 3/$22.50, 20/$101.00, 100/$420.00 4" x 4" x 48" - Inert Polypropylene Blueprint Storage Tube $12.95, 3/$33.75, 20/$176.00, 100/$725.00