Every good superhero never leaves home without a trusty utility belt and Spider-Man is no exception. The belt's main purpose is to hold extra cartridges of Spidey's necessary web fluid. Without it, his mobility and combat effectiveness are compromised, so bringing spares is crucial. The belt has also housed his all-important camera, enabling him to snap pictures of himself in action for an ungrateful and probably angry J. Jonah Jameson. The other main function of the utility belt is to house the Spider-Signal.