The Osprey Hydrajet 12 Hydration Backpack in blue is a versatile hiking trail pack designed for boys. Made of nylon and plastic, this backpack features a zip closure and one main divider for organizing items. With four pockets and a hydration reservoir (not included), this backpack is perfect for staying hydrated and storing essentials during outdoor adventures. The sleek design and durable material make it ideal for hiking and other outdoor activities, providing both style and functionality for an active lifestyle.