Review on Resistant Closure Sliding Replacement Tumbler by Jason Cho

Product description is literally true. It is leak proof but not leak proof. There is a good seal between the lid and the mug itself. The problem for me is that I carry the bowl in my golf bag so it sometimes tips and the liquid spills out of the drinking hole around the hole's sliding lid. We have 2 lids and this happens to both of them, so this appears to be a design issue and not a one off failure of either lid.