Msr stainless steel insulated mug description the finest backcountry mug ever the stainless steel insulated mug takes all the best properties of our favorite mugs and rolls them into a camp friendly design they feature a strong stainless steel lining with bpa free lid and an insulating non slip eva foam sleeve the sleeve is removable for easy machine washing and is soft so they pack quietly inside all of our cookware holding a full 12 ounces they re available in four colors to personali