Both plywood and OSB (Oriented Strand Board) can be used to build shipping crates, but plywood is usually the better choice when strength, durability, and appearance are important.
Plywood is made from multiple thin layers of wood veneer bonded together in alternating directions. This gives it good strength in multiple directions and makes it less likely to swell or deteriorate quickly when exposed to moisture. It also tends to hold screws and fasteners well, making it a good option for heavy-duty or reusable crates.
OSB is made from compressed wood strands bonded with resin. It is generally less expensive than plywood and can provide good structural strength for many shipping applications. However, OSB can absorb moisture more readily, especially around exposed edges, and may swell if it gets wet.
For most high-value, heavy, or international shipments, plywood is often preferred. OSB can be a practical and economical choice for lighter loads, short-term use, or shipments where the crate will remain dry.
The best material ultimately depends on the weight of the cargo, shipping conditions, required durability, and budget.