This 6L hydration backpack is designed for young mountain bikers. It includes a 2L Hydrapak reservoir with a Phaser bite valve for easy hydration. The Air Flow back panel and breathable shoulder straps enhance comfort. A fleece-lined pocket protects sunglasses or phones from scratches. External attachment straps secure extra gear. The adjustable sternum strap has an integrated rescue whistle. Made from lightweight, 100% recycled polyester for durability.