Sigg WMB ONE Top Anthracite Screw Cap (One Size), Spare One Size, Antracite
It has a simple and attractive design in grey. With the ONE screw top, the bottle can be used with just one hand – that goes for carrying, opening, drinking, closing and securing. The screw cap is BPA-free and does not contain any pollutants such as oestrogenic substances or phthalates.