Whether you're walking, hiking, or running, the CamelBak FlashFlo 50 oz. Hydration Lumbar Pack gives you the hydration capabilities you want in a comfortable and stable lumbar pack. With its lower center of gravity, the FlashFlo gives you greater stability and more sure footing on the trail, and a padded air mesh back panel makes sure you're cool and comfortable. An internal compression strap keeps the water from sloshing around in your reservoir, and a CamelClip fastens the bite valve to your shirt or jacket for easy access. The FlashFlo gives you plenty of room to pack essentials, even an ultra light layer, and front and back reflectivity makes sure you're seen in low light conditions.