Tag Barrels are a type of barrel in Donkey Kong 64. They are used by the player to change to another Kong to play as, either Donkey Kong, Diddy Kong, Lanky Kong, Tiny Kong, or Chunky Kong. Each Kong has their head shown on a side of the barrel. If a Kong has not been rescued yet, the player cannot select them, and that Kong is instead represented by a question mark of their trademark color, even on the Tag Barrel itself.
Tag Barrels can be found in every level and the hub, DK Isles. There are usually five or seven Tag Barrels in every level, but DK Isles has has ten of them (one in each of the eight lobbies, one in the main area, and one near Snide's H.Q.).
If a Kong jumps into the barrel, the game shifts to a black character select screen with the selected Kong beneath a spotlight. Each Kong acts as if they want to be selected and show disappointment if they are not. While Chunky Kong does so, by shouting "Yoo hoo!", he acts cowardly and unwilling if the player highlights him, and he points to Tiny Kong for the player to select. By highlighting another Kong, Chunky expresses relief. When used, Tag Barrels fully restore the Kongs' health, even if the player selects the same Kong, so Tag Barrels act somewhat as a substitute over melons.
A similar kind of Barrel appears in Donkey Kong Country: Tropical Freeze, where it spins between the DD, DX, & CK emblems (this Barrel only appears in single player, as all DD, DX, & CK Barrels are replaced by the normal DK Barrel).