The Lagos 15L Hydration Pack provides lightweight storage and convenient hydration for time on the trail. Designed with a variety of pockets and compartments for your gear and a 2.5L reservoir for your H2O. " backpack outdoor carryon, personal both, no Description A recycled hydration pack for hiking and mountain biking. Designed for Trail runs, mountain biking excursions, day hikes Trip Length Day trip Carry on compatibility Personal item Features Ventilated and breathable back panel and waist belt wings Custom 2.5L Hydrapak™ Shape Loc Reservoir included Dedicated reservoir hanger in main hydration compartment Magnetic hydration tube attachment on left waist belt Exterior stretch mesh bottle pockets Exterior zippered organizer pocket Dimensions 20" x 10" x 8" Weight 1 lb 7 oz A hydration pack for hiking and mountain biking - with a daisy chain for bike light attachment