I bought these vacuum freezer bags for a Foodsaver brand sealer. They are much cheaper than bags at local stores and I love the size. They are perfect for freezing smaller sized amounts of meat or sausages. They only fit about 1 pound or less of meat-whether it's ground beef, steak, or chicken. If you try to put more than that in, then there isn't enough room at the top to seal it. I can see why some reviewers may have had trouble getting them to seal. If you don't have 1 1/2 inches at the top, there's not enough room to place it in the foodsaver and suck out the air/then seal. That's how the larger sized (quart and gallon sized) work also. It's perfect for portion control-for a family of 2 to 4 people. We had no trouble at all sealing the bags with all the air out. Our meat will last months now in the freezer without freezer burn.