I vaccum seal mine... Just finished the last of the sockeye from the summer, and we now have about 4 coho left, and a 1/4 of a steelhead...
When sealing, do your best to get as much of the surface area in contact with the plastic as you can... I move around the filet after sealing to work any remaining air to one side. That way in 5 months you can easily trim off the freezer burned part... There will always bee some sort of damage if left that long...
The freezing in milk cartons is supposed to work very well.
Also, the natives freeze them guts in, and clean them when they thaw... that keeps the body cavity from being burned.
However, if not vaccum sealed as well, you'll see freezer burn actually prenetrating the skin, a few millimetres into the flesh.
Also, write the date of the fish on your bag, and re arrange the stock once the season is done, to put the newest stuff in the back of the freezer. If you want a premium freshie you can always go to the back, but at least you'll be encouraged not to waste fish when you discover the only fish left are the old burnt ones in the back.
Cheers,
Nicole