Not really I don't think. As Soybomb said, trying to seal piping hot may be different. I usually let the meat cool completely and seal it all up later. I can't say it's always "refrigerator cold" when I've done it, but even then, very little moisture loss (if any).
Big JT's Smokin' BBQ Competition Team
"The path was worn and slippery. My foot slipped from underneath me, knocking the other out of the way, but I recovered and said to myself, 'It's a slip and not a fall.'"