That doesn't look like much of a lip around the base of it. I can see it being opened during the cooking process and left open for hours on end while all kinds of water and juice and liquid get spread all over that counter...and then flow right down into the receptacle base.
If it forms a tight seal while closed, it's a neat idea for surfaces that have to be occasionally cleaned, but not for surfaces that will get wet while it's open.
-John
