The Santeco Kolima 500 is a compact vacuum flask with a screw stopper, here in Carbon Black. It is a good size for a lunch box, a cooler bag or a day out: fill it with coffee, tea or ice water in the morning and it is still at temperature hours later. The body is food-grade 304 stainless steel with double-wall vacuum insulation, and Santeco rates it to keep drinks cold for up to 24 hours and hot for up to 12 hours. The screw stopper seals the flask so it can travel in a bag, and the wide mouth makes it easy to fill and clean. The matte powder-coat finish resists scratches and gives a good grip, and the flask does not sweat. It is BPA free with no chemical taste or smell.