As part of Battleborn Day, anyone that logs in between 10am CST Saturday and 10am CST Sunday (February 18 and 19) receives a free loot booster in-game!
To activate your loot booster, go to the command menu, then go to the marketplace tab, then go to the boosts section. Your owned boosters will be shown at the bottom of the screen, where you should be able to see and activate your loot booster. Once active, the loot booster’s effects will remain active for 24 hours of real time.
There’s no in-game notification about the free boosters, so I’ve seen a lot of players not running them yet. Loot boosters give better gear packs the more players you have running them on your team, and the lootpocalypse further increases the drop rate from these packs.