For a while, somebody was making bags that had a liner in them that would trap the moisture, but I haven't seen them in a while. It worked great when I vacuum sealed some greasy tamales. Another option is to put a strip of paper towel between where the food ends and the seal will be--that can help keep the moisture out of the seal, which can happen even when you pre-freeze things.
A fabulous thing about a vacuum sealer is the room it creates in my small Norcold freezer. Those big bags of potstickers? I apportion them out, lay them flat in a bag, and suck them down and just slide them in there like books on a shelf.