An example of a packet for a card slot. The container may include a chamber for storing oil. The packet may have a shape and a thickness to fit within a slot that holds a credit card. The packet may include a first lamina and a second lamina. The second lamina maybe affixed to the first lamina to form the chamber within a sealed region along a first peripheral region of the first lamina and a second peripheral region of the second lamina. A combined thickness of the first lamina, the second lamina, and the oil fits within a defined volume. A first surface of the first lamina and a second surface of the second lamina is substantially flat.