Oasis flip-top vacuum flasks keep drinks hot for up to 6 hours or cold for up to 9 hours, by using vacuum insulation technology. They are made from quality 18/8 grade stainless steel inside and out, they are highly resistant to rust, are odourless and built to last. Each flask features a lockable flip-top lid with a silicon seal designed to ensure there are no leaks. Convenient and portable, great for our Australian lifestyle, and an environmentally conscious alternative to plastic bottles. 450ml capacity, fits most standard car cup holders, BPA-free