May I suggest the Mossy Oak stainless steel tumbler. It's just a few dollars more than the Ozark Trail and has a cover for the lid holes. Only $2 more than the OT.
https://www.walmart.com/ip/Mossy-Oa...unce-Double-Wall-Stainless-Steel-Mug/51240751
https://www.walmart.com/ip/Mossy-Oa...unce-Double-Wall-Stainless-Steel-Mug/51240751