Bonus Barrels
The Bonus Barrel shown above is in Donkey Kong Country 2 and 3. Jumping into it takes you to a bonus level like, BASH THE BADDIES, COLLECT 20 STARS, FIND THE COIN, ETC.
 
The ' Up ' Barrel shown above this sentence is a special barrel used in DKC 2 and 3. When you jump in it, it moves you ( and itself ) up higher, and then blasts you out of itself.

               Items in the Donkey Kong Series Home