Requires base game in order to add to account.
The Battlefield 4™ Soldier Shortcut Bundle DLC is currently free on Steam. Original price is $24.99, seems like a good pickup if you do have the base game.
With the Soldier Shortcut Bundle, you get immediate access to an armory of weapons, gadgets, and specializations to give you a boost on the battlefield. The bundle includes the Assault Shortcut Kit, Engineer Shortcut Kit, Recon Shortcut Kit, and Support Shortcut Kit – no matter your class of choice, you're covered. Whether you’re new to Battlefield 4 or just want to make up for lost time, Shortcut Kits help you go toe-to-toe with Battlefield veterans by instantly unlocking powerful gear and bonuses that would otherwise be obtained through play.