The MSR Gray Stainless Steel Mug combines the best properties of an insulated mug into a camp-friendly, backcountry design. It features a strong stainless steel lining with BPA-free lid and insulating, nonslip EVA foam sleeve that's removable for easy machine washing. This soft sleeve also helps in packing quietly inside other cookware. Holds 12 oz. Wt: 4 oz.