https://www.pcgamer.com/fortnite-rolls-out-portable-rift-to-go-and-score-royale-ltm-updates-playground/

As our Samuel Horti reported yesterday, Fortnite's next item is a pocket rift that teleports you skywards. Then, it was "coming soon". Today, it's here—alongside the return of the Playground limited-time mode, and a host of other nips and tucks courtesy of update v5.30. 

As very briefly teased in the trailer up top, the Rift-To-Go lets players conjure rifts on the fly, for personal use and for squads. A few scenarios play out above, but I reckon the best fit is the first—getting the drop on unsuspecting foes. "Escape danger or dive into it," says Epic in the latest update's patch notes. "The Rift-To-Go is any player’s ace in the hole, creating a Rift for themselves and allies. Be careful that no enemies follow you through."