The Port-A-Fort is the most recent item that has been added to Fortnite and has helped players to defend themselves in tricky situations and gain the higher ground.
The Port-A-Fort only comes in the Epic rarity and when players throw this item, it creates a metal structure that gets built immediately upon impact.
There has been a bug that has been discovered by many players that has not been addressed by Epic yet. One Reddit user has posted the bug that occurs with the Port-A-Fort:
As you can see, when the player throws the Port-A-Fort, another one appears, ultimately creating infinite Port-A-Forts.