Packing may refer to: In Mechanical engineering: Packing, also known as an O-ring or other type of Seal (mechanical), a term for a sealing material Packing gland is a mechanical term for the groove in which a packing sits. In Chemical engineering: Structured packing, for example internals of a distillation column In Mathematics: Sphere packing, a 3-dimensional mathematical problem Packing problem, a recreational mathematics approach Set packing, a classic computing problem. Packing may also re… (More on Packing)