WWII Era US NAVY Aviation Seapack OSHKOSH Miltary Suitcase Luggage. This is a WWII US Navy “Seapack” or “Sea Bag, ” a type of suitcase used by naval personnel. It was designed for durability and to withstand the harsh conditions of naval service. Contains all of its original inserts. 25″ X 20″ X 8.25. Please take a moment and read our Terms of Service which set forth the contract between you and MSGEngineering when you use our services.