These are 3 liter (100 oz) hydration carriers from Camelbak. The carrier is made of Cordura, and therefore is extremely durable. You can easily adjust the shoulder straps. Also, you can use the D rings for attaching accessories. The insulation keeps liquids cool while out in the heat. Also, it prevents freezing in the cold. You can access your hydration bladder via the zipper in the front.
We do not include the bladder with this item. These carriers are aftermarket and not Military issue.