Note: This listing includes the 5L race vest backpack only. Hydration bladder (2L) and soft bottle (500 ml) are not included. Hydration Backpack Designed with two storage compartments to hold a 2L water bladder and a 500ml soft bottle, helping you stay hydrated anytime without impacting your pace. Elastic front straps and hose straps keep the bottle in place and prevent wobble, bounce, or noise when drinking. Storage Compartments 5L hiking backpack with a main compartment suitable for clothes and basic first aid items. Lower zipped pocket is ideal for valuables and can hold a 5.5' mobile phone. Unzipped pockets provide easy access for energy supplies and sunglasses, keeping essentials within reach. Ultra Lightweight Made of quality nylon and weighing only 140g, offering low resistance and wear resistance to reduce load during running. Soft, breathable mesh on the back and shoulder straps promotes airflow and wicks moisture to prevent heat buildup, keeping your back cool and comfortable. Designed for middle to longdistance running. Fit You Well Ergonomic vestshaped design with adjustable waist and chest straps for a snug, comfortable fit during runs. Adjustable features minimize bouncing and shifting and help prevent chafing. Reflective logos and strips on the front and back enhance visibility and safety in lowlight conditions. Use scenarios Longdistance trail runs and ultramarathons: lightweight, secure hydration and accessible storage for essential items without slowing you down. Day hikes and weekend outdoor activities: compact yet functional storage for clothes, first aid, valuables, snacks, and sunglasses with quick access. Multisport workouts and hands activities: stable fit with reflective safety features for improved visibility.