When excursions on the mountain bike becomes demanding on the unbeaten path you need certain equipment that allows you to bring along the necessary spare parts, protection for downhills and extra water. Effective items that responds to all weather conditions and to address the lack of liquid and energy there is non other than a hydration pack, possibly with built-in protection for the back so as to also increase safety in the most extreme descents. The size of the hydration pack should be taken into consideration to ensure the necessary space but also to avoid unnecessary obstacles blocking the movement of the body while riding. Camelbak and Evoc are the undisputed leaders in the market, with no competitors in the terms of versatility and innovative solutions tested directly on the race tracks and transferred in series of products.