Let me share a little secret with you about vacuum sealers. Do not waste your money
or space on them. If you want to vacuum pack your foods, all that is necessary if good ziplock bags (a lot easier to store) and a bucket or sink full of water
is very doable, especially for fish
and seafoods). Whatever you are sealing, place te item in the appropriate ziplock, and slowly immerse the bag in the water forcing the air out of the bag. When you reach the level of the Zips, close the locks. As long as you keep the majority of the waters out for your meats and fishes, a little will not hurt as all of them contain some moisture anyway. I have used sealers in the past prior to learning
this method and none of them worked any better than this. Being an avid fisherman, I have had up to 400 lbs of filets and steaks in my freezer
for up to a year and will tell you the ziplock method works better. For boaters concerned with space, it should be a no brainier.