Battlefield 1 ™ Shortcut Kit: Ultimate Bundle is currently free to keep forever on Steam until the 24th of September. It's normally $49.99.
It does require the base game Battlefield 1 ™ in order to play it, since this is just a DLC.
It’s the dawn of all-out war, so you’d better go in armed. The Ultimate Bundle includes the Shortcut Kit: Vehicle Bundle and the Shortcut Kit: Infantry Bundle, which contains all Shortcut Kits for the classes Assault, Medic, Scout and Support.
The Shortcut Kit: Vehicle Bundle gives immediate access to all vehicle packages earned through gameplay progression for the following classes: Landship, Heavy Tank, Light Tank, Artillery Truck, Fighter Plane, Attack Plane and Bomber Plane. It also includes primary weapon unlocks for the Tanker and Pilot class.
The Shortcut Kit: Infantry Bundle contains all primary weapons, sidearms, and gadgets earned through gameplay progression tied to each class (Assault, Medic, Scout and Support).
Only base game progression items included. This Shortcut Kit does not contain items offered in future downloadable content, items added in expansion packs, content that must be unlocked through Battlepacks, or promotional offer items.