“Backpack” is the 12th track off Justin Bieber’s second compilation album, Journals. The song features New Orleans rapper Lil Wayne. During the song, Bieber sings about rescuing an alien, who’s portrayed by Lil Wayne. In his verse, Wayne raps:

Greetings, I fell from the sky
I’m from a different world I use Lil Wayne as a disguise

It’s another example of Bieber trying to cling to a valued relationship.