Even the humble wooden crate cannot escape the government’ watchful regulatory eye. The rules include provisions for:
-Which types of trees from which countries may be used to make crates.
-Bark removal from the logs used to make the crates.
-Pest inspection.
-Heat treatment.
-Fumigation.
-Treated wood must be marked (the Department of Defense is exempt from this requirement).
-There are other rules for bamboo crates.
-And for loose wood.
Inertia Wins! 
Similar to corrugated fiberboard in overall characteristics, plastic corrugated is typically extruded from polypropylene. Advantages include excellent moisture resistance and increased durability. Also can be use with Foam, corrugated and wood