This product leaks miserably and thereby fails in its singular function as a vessel for hot liquids. Here's our experience...We chose this cup for our small, eco-friendly business to serve coffee in at a farmers market. A customer returned to our booth to show us that her cup she had received minutes earlier was leaking from the bottom seal. Hot liquid leaking on our customers on our first day at the farmers market. No bueno. We ran a test to see if this was a fluke and poured some coffee in a cup and set it on a table. Within minutes, the bottom was saturated and it was leaking. We doubled up with another cup to capture just how much liquid was coming out. As you can see in the pictures, it's enough liquid in a short enough period of time to render the cup not only useless, but a liability. (Because liquid collected in the second, doubled-up cup, the coffee eventually leaked through that one as well. Even doubled-up these cups are not functional.)We've initiated a return and, sadly, we are unsure whether we'll be able to stay in the eco-cup arena. PLA lining may simply be insufficient to contain hot liquids.