A bulk container, also known as a bulk box, bulk bin, pallet box, or gaylord, is a pallet-sized box used for storage and shipping of bulk quantities. Bulk boxes are often made of corrugated fiberboard, either double wall or triple wall. Many corrugated bulk boxes have covers. The main body of some is similar to a half slotted container with flaps on the bottom; others have a separate base (similar to the cover) and a sleeve for side walls. Additional corrugated liners and box reinforcement are sometimes used to control bulging. Wooden boxes are also used for bulk packaging: boxes made of aluminum and steel are common in heavy industry. Reusable plastic bulk boxes (molded or corrugated plastic) are used for some products and logistics chains.
For some products, inner plastic liners or bin bags are used to protect the contents. Liquids sometimes uses sealed inner bags with integral valves. Most bulk boxes are recyclable, returnable, or reusable. Some styles of boxes fold (knock down) or come apart for easier return shipments.
In the U.S., the term gaylord is sometimes used for triple wall corrugated pallet boxes; this is due to the first bulk bins being manufactured by the Gaylord Container Company.