These easy-access, replacement SnapFlask bottles accept your favorite performance fluid. Keep them handy for race day Bottles work with SnapFlask module technology, which features easy release and snap-in attachment to the docking base sold separately. Each flask has a wide, 35mm mouth that makes filling and cleaning easy. Includes two 10.5-fl. oz. bottles for a total of 21 fl. oz. Polyethylene is 100 BPA free.