One of the confusing gameplay items/systems to new players in Call of Duty DMZ is the Bags. Like in other multiplayer games, Bags are crate-like items that hold valuable possessions and can be opened with a key.
One of the most opened Bags during the initial Stage of the DMZ campaign is the Stage Bag; to open the Stage Bag, you must first acquire its Key, then use it to open the actual Bag hidden at the back of a music concert stage north of the main University building.
Where is the Stage Bag Key in Call of Duty DMZ?
Before finding the Stage Bag, you need to find the associated Key to open it. The best way to locate Keys is to explore the environment by examining crates, bags, and dead bodies, as they can spawn anywhere on the map. Still, many players have reported they have found the Stage Key inside a house around the Cruise Terminal Area and the Barista's Bag inside the Mall.
Look in these areas before exploring other common Key Spawn locations from the below map.
Apart from random spawn locations, you can also obtain Stage Keys by finishing the HVT contracts featuring them.
Where is the Stage Bag in Call of Duty DMZ?
As mentioned earlier, you can obtain the Stage Bag in Call of Duty Season 4 on a big Stage north of the main University building.
Once you reach the Stage-like area, hop on it, and you will find a camo-colored bag at the back of the Stage. Interact with the Bag and use your Stage key to open it. The most common type of items found inside the Stage Bags are money, Security Notes, Keys, and Graphic Cards.
For more on Call of Duty, check out DMZ Hydrogen Peroxide Location, or Where to find the Phalanx dead drop location (map) in DMZ on Pro Game Guides.