USGI 3 Colour Desert Hydration PackNOTE *Some may have different replacement mouth pieces to the one pictured. Combat uses an incredible amount of energy causing the body to sweat its water stores out. The ability for a soldier to drink during combat hands free is a major advantage when compared to the humble old canteen. These 3 colour desert hydration packs are a product of the US Army's early attempts at modernising the way their soldiers hydrate. The pack comes equipped with two