Abstract: Disclosed is a dimensionally firm transport box, particularly container, which has firm and substantially plane side walls and a bottom wall and a cover. Each side wall is made from a two shell construction according to which spacer elements are arranged between the two shells of each side wall so as to mount the inner shell to the outer shell in spaced relationship. The spacer elements and/or the inner shell may have sufficient elasticity to withstand an increase of pressure of gas by which an air bag mounted to the inner shells may be inflated. The air bag is divided into communicating compartments which are associated to the side walls. A filling valve for the air bag is disclosed which has security features for preventing unauthorized use. Specific cooperating profiles are provided for removably mounting each compartment to its associated inner shell.