55 gallon drum
From Halopedia, the Halo wiki
The 55 gallon drum is used by the UNSC to hold water and other liquids vital for combat, such as liquid hydrogen. They are made of metal to withstand the wear of combat, and are typically found in fortified friendly positions. They are green in color, and appear to be three feet tall. It is also a rounded square prism in shape. The printing is in yellow, common in UNSC containers.
- They are also one of the scenery objects a player may use in Halo 3's Forge. In addition, there is a 12 gallon drum which can be spawned in Forge.