Our 40" x 18" x 8" 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 40 x 18 x 8 shipping boxes are made from 200 Pound test, kraft C-flute single wall corrugated carton. These over-sized standard boxes are designed for shipping or storing those larger and wider specialty items.