Alvin BSB46 Self-Sealing Blueprint Shipping Bag 13" x 46", Polyethylene Material; Makes packaging and shipping blueprints hassle-free; White Exterior and Gray Interior; Opaque bags are made of heavyweight 0.0035 mm; Co-extruded plastic material; UPC 88354225232 (BSB46 BSB-46 BS-B46 ALVINBSB46 ALVIN-BSB46 ALVIN-BSB-46)

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