2.0L Flat CleanTech bladder and 10L Cargo Chest Impact Protector Removable Back Protector CE Level 2 CE tested and certified as impact protection: Chest EN1621-3 Level 2 Back EN1621-2 Level 2 Multi-layer, multi-plate articulating design for added comfort Optimal AirLine back ventilation Side and shoulder adjustment Dedicated tool and hydration compartments Waterproof mobile phone pouch Volume regulating straps on backpack Waist belt pockets Left and right hydration tube channelling Optimized fit with or without a Leatt® neck brace Sizing: Adult Plastic Free Recyclable Packaging HYDRATION CARGO AND PROTECTION ALL IN ONE FOR MOTO Redesigned for 2023, the Chest Protector Moto 4.5 Hydra offers CE Level 2 certified impact protection for the chest and back, a 2.0L bladder, and 10L cargo capacity. The vertical CleanTech bladder has a center baffle to help reduce the fluid sloshing around, the feed tube can be routed over the shoulders or under the arms. The tough, water-resistant outer shell is equipped with storage and compartments, including a waterproof mobile phone pocket. If you are looking for something similar without the full protection, take a look at the Moto XL 1.5.