Grenade Bags (or Boxes) contain grenades for the player to pick up throughout the Call of Duty series. In some cases, a grenade box is the first time the player will encounter grenades in a level. In Call of Duty and United Offensive, grenade bags can be found at preset locations and cannot be picked up from troops. From Call of Duty: Finest Hour onwards, grenade bags are dropped by enemies in their respective campaign.
In Call of Duty: Finest Hour, enemies may drop grenade bags upon death.
Grenade bags can be found in areas where the player gets ambushed, and in some tunnels, but only in few instances and limited quantities. The player may need some to destroy motorcycles in some levels or to eliminate large numbers of enemies near machine gun nests.
In Call of Duty 3, grenade boxes are dropped by random enemies, each containing anywhere from one to three Mk2 frags, Model 24 Stielhandgranate,or smoke grenades. Certain boxes that have an eagle and swastika on the cover can be opened by meleeing them. Otherwise, these boxes contain the same contents as regular Grenade Boxes.
In Call of Duty: World at War, single grenades are dropped, but have the effect of grenade bags. The single grenade can give the player more than one grenade at times, much like a regular grenade bag would.
Grenade Bags are found on the wall in exactly the same places as their respective World at War maps. They cost 250 points and give four Stielhandgranates. Unlike the Bouncing Betties, these yield an unlimited amount of purchases, as long as the player can afford them.
In Call of Duty: Modern Warfare 2, enemies drop grenade bags that give the player one grenade and occasionally a flashbang, similar to Call of Duty 4. They have the same appearance as bags in Call of Duty 4.
In Multiplayer, if the player uses the perk Scavenger, deceased teammates and enemies drop a blue colored bag upon death, which restocks the player's ammunition and grenades.
Again, enemies in campaign can drop grenade bags in Call of Duty: Modern Warfare 3. Grenade bags also appear on the multiplayer map Lockdown, though they are not obtainable. In one section of the map, soldiers can be found hanging from a post. One of them has a grenade bag attached to them, containing Molotovs.