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Material is a bit different from the food saver brand but work the same for less. We bought two packs of the 8x12, out of those we had 3 bad bags. We are not sure if it was user error or not. They sealed initially but did not keep.
I have found these bags the easiest way to prep food and Sous Vide cooking. The rolls work but it’s time consuming. These bags are great for wet aging steaks then freezing them. I have used hundreds of these in all sizes with no downside.
I bought these because the price of Food saver bags has gotten so high. While the quality is not quite as good as food saver, they perform well and I will be buying more. They are a very good alternative.