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Are plastic bags (i.e., small sandwich bags) air tight?

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Sometimes, for a while. However, I wouldn't count on it for anything even a little bit important. Zip style bags can seal OK but have very little resistance to any internal pressure, squeezing the bag, etc. They also have low puncture resistance, UV resistance, and other features that make them short-term airtight at best. read more

Zip style bags can seal OK but have very little resistance to any internal pressure, squeezing the bag, etc. They also have low puncture resistance, UV resistance, and other features that make them short-term airtight at best. read more

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