Manufactured from heavy-duty 275# DW/ECT-48corrugated. Heavy-duty construction provides greater protection and stacking strength. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping. Heavy-duty double wall Kraft corrugated. Boxes are shipped flat in bundles of 15. Offers great stacking strength, so you can minimize necessary storage space. Folding design allows you to break down the box quickly when not in use. Eco-conscious choice - has one or more meaningful eco-attributes or eco-labels. Twice the protection of a standard carton.