A luggage including a shell composed of a first half-shell and of a second half-shell, the first and second half-shells (14, 16) being pivotally mounted on each other, the luggage including: a closing device for holding the first and second half-shells (14, 16) against each other in order to close the shell, at least two casters (26, 28), each of the casters being mounted on a support, the first half-shell including two housings for receiving the supports of the casters (30, 32), a vacuum stowage device disposed in the first half-shell, the vacuum stowage device including a cover with a main compartment provided with an opening, a sealing device for sealing the main compartment, and a check valve arranged so as to block the entry of air into the main compartment and allow a release of air out of the cover when the main compartment is sealed, and a fixing device for removably fixing the vacuum stowage device to the first half-shell, the fixing device including a first fixing member and a second fixing member, the first half-shell comprising the first fixing member while the vacuum stowage device includes the second fixing member, the first and second fixing members (92, 94) being arranged to cooperate with each other in order to attach the stowage device to the first half-shell; the luggage further including a stiffening plate, the luggage being characterized in that said stiffening plate includes a body and at least a first end portion which is tiltable relative to the body, in that the second fixing member comprises the first end portion, and in that the first fixing member includes at least a first holding element cooperating with the first end portion in order to hold the stiffening plate relative to the first half-shell. a closing device for holding the first and second half-shells (14, 16) against each other in order to close the shell, at least two casters (26, 28), each of the casters being mounted on a support, the first half-shell including two housings for receiving the supports of the casters (30, 32), a vacuum stowage device disposed in the first half-shell, the vacuum stowage device including a cover with a main compartment provided with an opening, a sealing device for sealing the main compartment, and a check valve arranged so as to block the entry of air into the main compartment and allow a release of air out of the cover when the main compartment is sealed, and a fixing device for removably fixing the vacuum stowage device to the first half-shell, the fixing device including a first fixing member and a second fixing member, the first half-shell comprising the first fixing member while the vacuum stowage device includes the second fixing member, the first and second fixing members (92, 94) being arranged to cooperate with each other in order to attach the stowage device to the first half-shell; the luggage further including a stiffening plate, the luggage being characterized in that said stiffening plate includes a body and at least a first end portion which is tiltable relative to the body, in that the second fixing member comprises the first end portion, and in that the first fixing member includes at least a first holding element cooperating with the first end portion in order to hold the stiffening plate relative to the first half-shell.