Light and practical backpack with specific design for trail running. It is a backpack born directly from the experience in the endurance race Tour de Geants, perfect for experienced runners in races of several days, as for those who are now starting in this discipline. It is fully adjustable during the race in the suspenders and the belt, allowing each person to adapt at any time to their own needs and measures. In addition, it has been equipped with everything necessary both for a training session and for a race. The Mountain Runner 12 for trail running of the Grivel brand has two front bottle cages, an inner pocket for the hydration bag, pockets of different sizes and forms of easy access, front elastic that can be used to store clothes and adjustment system of the backpack among other features many techniques specifically designed for the race. Characteristics: Two 500 ml bottle barrels at the front. Interior pocket for the hydration bag. Pockets of different sizes and shapes easily accessible. Elastic and / or zippers to accommodate bars, gloves, buff, telephone and everything that should be easy and fast access. Small upper bag designed to house part of the mandatory equipment required in the competition, such as the thermal blanket or keys and money. Elastic front store a jersey, a jacket etc., which also allows you to adjust with the backpack put and better bring the content against the body improving transport. Double adjustment chest strap. Adjustable lumbar belt. Adjustable straps Two pole holders. Two double side pockets, one with zip and another elastic. Pocket for the phone. Whistle. Material: ventilated mesh. Volume: 12 liters. Approximate weight of 510 g.