Get those digits. Reactive: Displays your number of eliminations in the match.
Tabulator backpack is a Rare Fortnite Backpack from the Calculator Crew set. Back bling Tabulator 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 Calculator Crew contains 5 cosmetic items.
The backbling Tabulator belongs to Chapter 1 Season 7. It's not yet known how to get the backbling Tabulator.