This very economical hydration bladder by Lancer Tactical is very tactical and convenient as it easily slides into your hydration backpack with resealable and refillable cap design. Simply carry 2.5 liters of fluid around hassle and hands free to ensure proficient hydration during combat or even your daily life. This bladder pack features a bite valve system to easily stop and start the flow of liquid. This pack can be easily added into your typical daily use bags for multi-purpose functions. Not only is the bag very versatile, but the price is as well.