I have used ziplock bags from other manufacturers in the past with 100% success. These were cheaper than the brands I usually work with, so I optimistically went for them. I used 140ft of these rolls and sealed a bundle of salmon fillets for 2 freezer servings. I was so sad when at the end of the salmon season, about 3 months, I was organizing the freezer and about 10% of the packaging was ripped off and the beautiful salmon in the freezer was burned! I'm so careful with my vacuum packing. I even spend twice as much time sealing packages twice (side by side, not on top of each other) specifically to prevent this. I don't usually leave negative reviews, I was embarrassed to leave even less than 3 stars. but it was an expensive and sad result of hard work. I hope this is just my experience and not a common problem with these bags. It's probably my fault for not reading all the reviews. The cost seemed good. Those that seal successfully are fresh and easy to use.
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