Works well but does not last

I was given one of these bags as a gift and used it for several months with my sous vide--but the bag ripped down the side (starting at the seam). I figured I had somehow cut it with a knife, perhaps while cleaning, and so ordered another set. I've only had these bags short while--about six weeks--and last night noticed that one of the bags has already ripped, again at the seam, and so is unusable. Too bad--it's a great product if only it lasted.

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