“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.