Battle Packs

I'm sure most of you are aware but, when playing you receive Battle Packs/Brief Cases, you can open your battle log and access the Battle Packs. From there you can select your gift. Gifts range from equipment to increased leveling up.

Kinda a neat concept and explains how some players are already level 30+

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What are Battlepacks?

Battlepacks add an all-new layer of persistence to the multiplayer progression system in Battlefield 4. Through the course of your multiplayer career, you will receive Battlepacks containing random combinations of new camos, dog tags, knives, XP boosts, and more! These items are designed to add customization options to give you more personalization options on the Battlefield.