This will give you 3x Summer Lootboxes

Each lootbox opened can give you up to 13 unique rewards. You will always receive 6 guaranteed unique rewards (4 rewards from the Random Rewards category and 2 rewards from the Bonus Rewards category).

When you open a lootbox, you have a chance to hit the jackpot. If you hit the jackpot, every item under the "Jackpot Rewards" section will be given to you in addition to your other rewards.