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<p>[QUOTE=&quot;GDJMSP, post: 7999617, member: 112&quot;]Heat sealing them is a waste of time as it no more effective than the zip seal the bags are made with. The reason I say that is quite simple, it&#039;s because the plastic that bag itself is made of is air permeable. Meaning air can pass right through the face of the plastic bag. In other words it&#039;s not bag&#039;s seal that leaks air, it&#039;s the plastic itself that allows air to pass right through it. Granted, it&#039;s at a very slow rate but it still passes right through it. </p><p><br /></p><p>You can prove this to yourself very easily and as quickly as overnight. Simply put anything that has a strong scent, something like a couple slices of onion or even some oatmeal cookies, in a Zip-lock and seal it up - heat seal if you prefer. The next day pick the bag up, put it to your nose and smell - you will smell whatever is in the bag. And the only reason you can do that is because air is passing through the face of the bag itself.[/QUOTE]</p><p><br /></p>

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