The ATOM 4 backpack is worn like a vest on the skin. It is designed to meet the constraints of the most demanding athletes. This ultra light backpack allows you to carry essential equipment for trail running. Its 3D Mesh Coolmax® All season materials offer unique comfort in the world. It improves thermoregulation and improves physical performance. Perfect balance between lightness and stability. This backpack is ideal for Trail, but also mountain biking, or Nordic skiing. This minimalist bag offers 4L of storage space, thanks to its 4-way stretch technical fabric and its two pockets secured by a zipper. The accessories are quickly accessible and very well maintained. Just think about running, this bag can be forgotten even in extreme conditions, in high heat!