Disguise kit

From TF2 Wiki

The Disguise kit is an essential part of the Spy's equipment that appears as a box of cigarettes. When selected, the disguise screen fills most of the screen. You are able to select a class with the number keys, and switch teams with the minus (-) key. On the console versions, you press left and right on the D-Pad to cycle through the available disguises and press "Triangle" (PS3) or "Y" (Xbox 360) to switch teams. Disguising takes a few moments, and once finished, a line drawing of the spy shows up briefly on the player's screen to let them know they have successfully disguised. The line drawing also appears when the player's disguise is broken.