Hydro Flask with a wide-mouth design and convenient Flex Sip Lid, offering 24-hour cold and 6-hour hot insulation. I just brought it back from Los Angeles. I've used it a lot, but the insulation is excellent for the price. - Brand: Hydro Flask - Capacity: 473ml (16oz) - Features: Wide mouth, Flex Sip Lid - Material: Stainless steel - Functions: Leak-proof, 24-hour cold, 6-hour hot Thank you for looking.