I've tried sealing these in a variety of ways and with different types of heat seal materials. I really wish they would work but they are very flimsy and don't seal completely. This means that they are still leaking after vacuuming. They are not suitable for storing food. I think that's because they're too thin and while I couldn't find where they leaked, they leaked anyway. Mind you, I've even tried cutting open and resealing the bags a couple of times. Didn't try it worked.
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