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's a mechanical term for the groove in which a packing sits. In Mathematics: Sphere packing, a 3-dimensional mathematical problem Packing problem, a recreational mathematics approach Set packing, a classic computing problem. Packing may also refer to: Backpacking Meat packing industry, the process of cutting up a slaughtered an… (More on Packing)