(a) Mementos. Flags, patches, insignia, medallions, minor graphics, and similar items of little commercial value, especially suited for display by the individuals or groups to whom they have been presented.
(b) Official Flight Kit (OFK). A container, approximately 0.057 cubic meters (2 cubic feet) in size, reserved for carrying official mementos of NASA and other organizations aboard Space Shuttle flights. No personal items will be carried in the OFK.
(c) Personal Preference Kit (PPK). A container, approximately 12.82 centimeters x 20.51 centimeters x 5.13 centimeters (5x8x2) in size, separately assigned to each individual accompanying a Space Shuttle flight for carrying personal mementos during the flight.