I put a few fillets in a vacuum bag, fold a half paper towel in half and put that at the top of the bag, so its between the fish and where the seal is made, vacuum it and the towel will absorb the juice, without allowing it to mess up the seal, or be sucked into the machine, works great, also as the fish thaws, the paper towel will help absorb the extra juices so its not so messy when you open the package.
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Maybe a good "group buy" opportunity? I ordered bags by the case and probably have enough to last the rest of my life, I think I ended up paying about .15c each for decent bags, just the right size for a lb or two of fish.
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