Constructed from strong ECT-44 singlewall kraft corrugated. Holds 4 - 1 Gallon Plastic Jugs. UN Number: 4G/Y19.7/S (RC) 4G/Y19.8/S (TE) Use these containers as refills for foam shipper kits or to ship your own cans. Cartons are printed with mandatory warning information. "This side up" arrows are printed on 2 sides of the carton. Cartons ship and store flat to save space. In accordance with CFR 49 178.601B, shipper is responsible for choosing the correct packaging for product and for final closure. CONSULT APPROPRIATE REGULATIONS.