Definition
Loose materials or custom-cut pieces of wood, foam, or other materials placed around and between cargo to prevent damage during storage and transport. In the pallet industry, dunnage refers specifically to wood pieces used to brace, cushion, or separate products on a pallet or inside a shipping container. Like pallets, solid wood dunnage used in international shipping must comply with ISPM-15 requirements.
Related Terms
Crate
A rigid shipping container made of wood, typically with a fully enclosed structure of walls, floor, and lid. Crates provide more protection than open pallets and are used for heavy, fragile, or high-value items such as machinery, electronics, and military equipment. Like pallets, wooden crates used in international trade must comply with ISPM-15 phytosanitary requirements. Crates are often custom-built to the exact dimensions of the product being shipped.
Pallet
A flat transport structure, typically made of wood, that supports goods in a stable fashion while being lifted by a forklift, pallet jack, or other jacking device. Pallets are the foundation of modern material handling and logistics, enabling efficient storage, stacking, and transportation of goods. The most common pallet size in North America is the 48x40 inch GMA pallet.
ISPM-15
International Standards for Phytosanitary Measures No. 15, an international standard developed by the International Plant Protection Convention (IPPC) that governs the treatment of wood packaging materials used in international trade. ISPM-15 requires that wood packaging be debarked and treated by an approved method — primarily heat treatment or methyl bromide fumigation — to prevent the spread of invasive pests and diseases across borders.
Unit Load
A quantity of goods assembled and secured on a pallet to form a single handling unit for storage and transportation. The unit load concept is fundamental to modern logistics — by consolidating individual items into pallet-sized units, material handling efficiency is dramatically improved. A well-built unit load is stable, within weight limits for the pallet and handling equipment, and configured to maximize trailer or container space utilization.
Explore More Pallet Industry Terms
Our glossary contains 165+ terms covering everything from pallet construction to compliance regulations and industry organizations.