Unlock the mystery. Reactive: Changes style based on number of chests opened in a match.
Master Portal backpack is a Epic Fortnite Backpack from the Key Force set. This back bling is one of the Fortnite Battle Pass cosmetics in Chapter 1 Season 8. It was available once you have reached Tier 22. Back bling Master Portal is reactive. It means it changes or evolves (reacts) depending on certain things in game (damage dealt to opponents, if it's day or night...)
The Set Key Force contains 4 cosmetic items.
The backbling Master Portal belongs to Chapter 1 Season 8. This backbling was available as a reward by unlocking Level 22 of Battle Pass from Chapter 1 Season 8.