https://www.polygon.com/2018/1/9/16870834/pubg-loot-box-crate-probability-drop-rates-battlegrounds

In a refreshingly upfront set of patch notes today, the team behind Playerunknown’s Battlegrounds listed out the odds at which their newest line of cosmetic items show up in loot crates. It’s a first for them, and may be a response to their movement into the Chinese market where there are a different set of regulations about loot crates. Nevertheless, it raises the question: Just how likely are you to find that fancy t-shirt or leather jacket that you had your eye on?

In Battlegrounds, the only way to earn loot crates is by playing well. The more hits you land on your opponents, the more downs and kills you get all contribute to the amount of in-game currency you receive at the end of a match. That currency, called Battle Points (BP), can then be cashed in for crates.