Our 6" x 6" x 4" 200#/ECT-32 Standard-size corrugated boxes are designed to cater to all of your shipping and storage needs. The rigid cardboard construction protects contents and stacks securely. These 6 x 6 x 4 shipping boxes are made from 200 Pound test, kraft C-flute single wall corrugated carton. Great for packaging office supplies, small-sized or round-shape items.