Do you run? Rollerblade or cycle? The RUNBIEN backpack from Martes is perfect for these activities. The RUNBIEN backpack is a very lightweight and spacious backpack. You can pack all your essentials. An additional compartment allows you to mount a hydration system, so you won't risk dehydration on the trail. The mesh construction of the back and shoulder straps promotes better moisture management and faster drying. A whistle built into the chest strap and reflective elements improve your safety on the road. Key features: Capacity 8 liters Dimensions: 36.5 x 8.5 x 4 cm Weight: 0.2 kg Hydration bladder pocket Chest strap with whistle Reflective elements Carrying handle Technical specifications: Material composition: 100% polyester