A bag for walking with a lighter step, the Symbium 4 system features a hip belt designed to make the bag literally rebound and help the hiker to move forward. The belt absorbs shocks and reduces the force exerted on the back by 8% compared with a conventional backpack. This new system provides 720g of relief with every step for a 20kg bag, or 31tons less strain on your back during a six-hour hike. Walkers thus feel less tired and they can walk with a lighter step. Moisture wicking while carrying is ensured by the AirCooling system which guarantees good ventilation for your back. The built-in rain cover protects the bag quickly when it rains.