If the bike has a very narrow frame in which a conventional bicycle bottle cannot be placed, then the small TWIST bottle 450 is just the thing. Because this compact bottle with the magnetic-mechanical holder system has space even in the smallest frame. TWIST bottle 450 + uni base Whether children's bike or fully – together with the flat magnetic-mechanical holder system, there is no frame in which this small bicycle bottle does not fit. Details: - 450 ml bottle volume - Perfect for small bike frames - Lid with self-closing membrane and optional dirt cap - Dishwasher safe - BPA-free polyethylene - Compatible with all TWIST bases