The Santeco Koya is a 380 ml vacuum insulated water bottle in Rock Grey, with a wide-mouth screw lid and a fold-down carry handle. It is made of food-grade 18/8 (304) stainless steel with a durable matte powder coat and double-wall vacuum insulation, which Santeco rates to keep drinks cold for up to 24 hours and hot for up to 12 hours. The wide mouth makes it easy to add ice and to clean, and the bottle does not sweat. At 380 ml it is light enough for children and slips easily into a school bag; it does not come with a straw. It is BPA free and leaves no chemical taste or smell.