The Ergon BX3 Evo backpack in black is a 15+3-liter MTB backpack (expansion via zipper). This backpack is designed with a one-size-fits-all carrying system that is adjustable in 4 directions, allowing it to be perfectly adapted to the anatomy of every rider. The Adaptive Carrier System load-balancing system and flexible alloy rails ensure that the backpack stays close to the rider's body without slipping. The wide, breathable hip belt distributes the load comfortably and relieves the strain on the shoulders and back. The backpack is equipped with a hydration bladder, rain cover, front pocket, side pockets, and multiple storage compartments, including a backpack holder. This backpack is ideal for mountain bikers looking for a practical and comfortable backpack for long rides. Product specifications - Brand: Ergon - Primary base colour: Black - Accessory attachment system: Other - Capacity: 15 + 3 litres (expansion via zipper) - Carrying system: One-size-fits-all, 4-way adjustable - Load principle: Adaptive Carrier System - Alloy rails: Flexible, horizontal - Water bladder: Included (in addition to the main compartment) - Rain cover: Included - Front pocket: Present - Side pockets: Present - Storage compartments: Multiple, including casque holder