In Battlefield series multiplayer, a kit or backpack is the in-game representation of a player's class, and is used to carry that player's weapons and gadgets. An icon (and occasionally the kit's design) helps players identify the kit's class from afar. Upon being killed, the player drops their kit (after a short delay in some games), which can be picked up by another player and swapped for his own. Early games have a dedicated button; with the use of console controllers, holding the button has now become standard.
Using another player's kit provides immediate access to the player's selected weapons and gadgets. Any deployed devices will still function for the original owner, though the player can resupply and deploy replacements (destroying the originals in the process). Battlefield V deviates from this system, only allowing primary weapons to be swapped.
In singleplayer, the kit mechanic is not used. The player's own equipment is freely customizable with no class limitations. The player can pick up weapons dropped by enemies and other weapons or gadgets the player finds, limited only by the two available weapon slots and two gadget slots. A more thorough inventory system is used for the Firestorm game mode in Battlefield V, with additional slots for healing items, armor plates, and spare gadgets.
- In games like Battlefield: Bad Company and Battlefield 1943, a kit appears as a duffel bag. In games like Battlefield: Bad Company 2 and Battlefield 3, a kit appears as the player's primary weapon.
- In most cases, the player's uniform and customizations do not change. For instance, a player appearing to be a Recon may occasionally be found carrying a picked-up light machine gun.