I wrap mine tight in good quality plastic wrap;2 or so fillets at a time depending on size. We then put 4 or 5 wrapped packages in a large zip lock an freeze in a chest freezer. Package and freeze ASAP after cutting. Works great for me. 6 + months and they are still awesome.
I have heard freezing in a little brine works real good also,though I have never tried it.
Yep Travis, I use the "Ziplock" food saver - works pretty darn good. Here is how I do Cod Fillets...First, inspect the fillets by holding up to the sun or a light - get rid of the pesky worms first. Then rinse in clean sea water - do not let fresh water touch the fillets. Then put them straight from the sea water into the ziplock bags. Get all air out possible and seal and freeze. IMO Cod is one of the best eating fish we have.
X3 on the zip loc-they wok great! I've had 2 of the electric bagger sucker machines and they both failed. So I'm standing in line to return the 2nd machine and the lady behind me says "oh yeah, those things always break, had a couple of high end ones and they were both junk, get the Zip Loc" This was in Ketchikan,AK where they also know a thing or two about freezing fish.