The Runner’s Bottle is an ideal, lightweight handheld flask designed to keep you hydrated throughout your run. 300ml capacity. Each bottle has finger grip indentation for added comfort and ease of use. BPA Free. Ultimate Performance's green Eco Bottles are 100% bio polymers made from plants, which absorb carbon dioxide while growing and when converted to polymer, are carbon neutral. Using the latest technology reduces the energy consumption needed to process plastics. The factory uses solar energy to power production and for lighting. These bottles are fully recyclable and we highly recommend them.