Dashmellow
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So it may seem that insulated bags are only good in concept. Anyway for lipo bags they do have a ziploc opening but the material is not permeable to air. It supposedly has a very very high flash point and melting point.
As far as insulated bags go, they will are good for keeping a sandwich cold for a couple of hours. The way you describe it, lipo bags sound like something a bomb squad would keep on hand in their truck.