The high-quality Trimm HYDRA water reservoir with a capacity of 2.5 liters can be used in almost any backpack with a water reservoir preparation. The Slide-T top opening allows easy filling and emptying of the bag and, of course, its cleaning. It will come in handy on a hike and during sports, when you need to drink easily and quickly. The high-quality Trimm HYDRA water reservoir with a capacity of 2.5 liters can be used in almost any backpack with a water reservoir preparation. The Slide-T top opening allows easy filling and emptying of the bag and, of course, its cleaning. It will come in handy on a hike and during sports, when you need to drink easily and quickly.