The Nathan 14oz. Soft Flask is a super lightweight and flexible bottle that is an awesome addition to any runner’s workout, but is best used when you throw it in a Nathan vest! The bite top helps with easy access to your water without it leaking or spilling anywhere. It also has a ExpoSpine that keeps it straight for it to glide in and out of a vest easily as well as making it easier to hold and carry in your hand. Feel free to buy additional straw tops to make it even easier to use in a vest!