The cap is round and gold with a sticker in the middle showing a red background, a yellow wave with a grey outline, and blue water.
Role in game
Jojo the Repairman states that he likes Kelpsi in the game. Patrick and Mermaid Man drank lots of Kelpsi and then saw who could outburp each other.
- It is a parody of Pepsi
- It is a combination of the words "kelp" and "Pepsi."
- In the episode "Welcome to the Chum Bucket," while Plankton is saying "as much as I love cruel sick jokes...", he is standing next to a bottle cap that looks similar to the Pepsi logo. This could possibly be Kelpsi's logo.