OK. Those of us that have experience with Tubos are familiar with the note on the side of most about the smokes staying fresh until opened. Any definitive info on how airtight they really are? From the one's I've had I just don't know that they are really all that airtight. Alot more than a stick out in the open, and probably more so than sticks in a cab, but actually airtight? I'm curious. Thoughts?