The medical-grade stainless steel we use for our stainless eddy and Groove bottles resists stains, scratches and corrosions, and it’s also naturally free of tastes and odours. Aluminium bottles are lighter, but they have to be made with an inner liner or coating that often contains chemicals and undisclosed ingredients. Our customers told us they’d rather have a slightly heavier bottle that’s tough and pure, so that’s what we made.