there are two reasons why they leak. 1 sip hole is on yhe seam. 2. Youve filled it too high and capillary action is drawing liquid under the lid. Two fixes. 1. Move sip hole by...(more)6-14-2016 6:40am+1 like
rotating lid. 2. Take top off, drink some coffee or pour some out. Completely dry the inside of the lid and put back on.