To pack an inflatable kayak for international shipping, fully deflate and clean it to prevent mould. Roll or fold it per the manufacturer’s instructions, and place it in a large plastic bag. Wrap the kayak in bubble wrap or foam padding, and protect any sharp parts. Use a sturdy, double-walled box, lining it with cushioning materials. Center the wrapped kayak in the box, fill any gaps with packing peanuts and securely seal the box with tape.