Well, it looks like Supply Drops are making their way into the Zombies mode this year!
Infinite Warfare’s Zombies in Spaceland features “Zombies Crates,” which are Supply Drops for Zombies mode. These Supply Drops are unlock-able using Keys, the same currency from multiplayer.
Just like MP, there are two tiers of Zombies Crates available: Common and Rare. They go for 10 Keys and 30 Keys, respectively.
Zombies Crates provide two random items and a pack of three Fate and Fortune Cards. These random items include Salvage, the same crafting currency, weapon variants, camos, and more. You have a better chance of earning Rare Fate and Fortune Cards by getting the Rare Zombies Crate.
The difference between MP Supply Drops and Zombies Crates is that MP Supply Drops does not let you earn the Zombies Fate and Fortune Cards. Other than that, it appears to have same items across the board.
The Keys are also the same currency you earn in MP, allowing you to get Supply Drops or Zombies Crates.