What is a bug stamp? August 03, 2022 19:47 A "bug stamp" or ISPM-15 mark certifies that the lumber a crate is made from meets international shipping standards. Related articles How long does it take to ship by standard air freight and sea freight? Do you offer trucking across international borders? Why do I need a power of attorney (POA) for imports into the U.S.? Why does my artwork have to be crated when shipping internationally? Can I use my own agent or preferred shippers for collection and delivery for my international shipment?