The 1200 ml / 40 oz happy camper is a double wall vacuum insulated mug made with pro-grade stainless steel. It features a durable powder coated finish and our truetaste ceramic-coated interior which preserves the taste of the stored liquid. It's fitted with a comfort-grip and a narrow base that will fit most cup holders. The lid features a rotating cover which engages the happy camper's three modes: straw mode, which holds the included reusable straw, sip mode, and full-cover mode.