As announced in September, Mountain Dew, Game Fuel, and Doritos (PepsiCo) are partnering with Activision to release limited edition Call of Duty: Modern Warfare marked products that include in-game bonus content for players.
The new promotion officially kicks off this weekend in the U.S. with retailers in the country starting to get in the new product to sell. You can find the marked packages in many retailers including Walmart.
The official Call of Duty site has added a landing page to start redeeming your Double XP codes with the new promotion. Specially marked packages of Mountain Dew, Game Fuel, and Doritos include a different amount of 2XP depending on the package you buy.
Purchasing Modern Warfare marked Game Fuel cans will also give you an exclusive Operator Skin to use in Call of Duty: Modern Warfare. The skin is exclusive to Game Fuel code enters till 12/31/19.
The legal language states: Limit 1 hr 2XP per day, 40 hrs total, applies to all 2XP redemptions for Call of Duty: Modern Warfare (not limited to this promotion).
2XP valid in full game Multiplayer mode only; use in other modes may be restricted.
The official website for the new promotion, alongside rules and legal wording is available here. Enter the codes on that website.