Product details:

The Revolution of Cold Chilled for 4+ hours Our Journey Series Insulated Hydration Packs offer the revolutionary insulation you expect from Hydro Flask, with our Cold Flow system that keeps water cold for over four hours. The insulated reservoir and neoprene sleeve with reflective lining maintain cold water temperature, while the articulated back panel lets air flow between you and your pack to prevent body heat transfer. Our Insulated Hydration Packs are the perfect solution to stay cool on your favorite ride, with enough capacity for trail essentials. Stay refreshed and enjoy the journey. Revolutionary Cold Flow System keeps water cold for over 4 hours. Our revolutionary Cold Flow System includes the first ever insulated reservoir, neoprene reservoir sleeve with reflective lining and articulated back panel to keep water cold for over 4 hours. Insulated Reservoir HydraPak IsoBound 3 L insulated sweat proof reservoir helps to maintain cold water temperature for hours. Neoprene Sleeve with Reflective Lining. Insulating neoprene reservoir sleeve with reflective lining keeps heat out and reflects cold back in. External Airflow Design Articulated back panel keeps space between you and your pack, letting air flow to avoid body heat transfer.