14 oz /414 mL BPA-FREE Nathan x Hydrapak soft flask with bite valve. Soft flask can be easily removed from sleeve. Proprietary soft flask interior rigid ExoSpine creates superior hand feel and support. Ergonomically-designed hand strap for grip-free comfort Breathable wicking mesh strap for maximum comfort Small expandable stash pockets for gels, keys and other small essentials. Weight With Soft Flasks: 2.54oz/72g. Storage Capacity: 15.25 cu in/0.25 Liters