Cavity packing: Planks of polyethylene foam together with a smooth liner, such as Teflon, can also be used to cavity pack certain objects. Cavity packing creates secure compartments for objects. Spaces the size and shapes of the objects are cut into the foam to create a cavity that separates objects and restricts movement, providing support/cushioning and still allowing for easy access. See MH-I, Appendix I and NPS Tools of the Trade, IV:4.