Sour Swirl

 is an Back Bling in Fortnite: Battle Royale. It could be unlocked by purchasing the Summer Legends Pack for $20 dollars.

Cosmetic Review
It appears to be some kind of backpack resembling some kind of candy with a pink and purple swirl. It has a keychain connected to the zipper that resembles some kind of candy with eyes, a mouth, and possibly a small hat. One of the eyes on the keychain is bigger than its other eye.