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I've never used a bag for charging. Mine barely warm up during charging, less than any other battery I've used in the past actually. I charge ANY battery away from anything that could catch fire and always monitor them throughout charging. I use a Pelican case, (I already had a few) for transport. Not because I'm worried about a fire but it just keeps everything together. A bag won't help against them getting banged around, crushed or punctured, any hard case should suffice. I recommend plastic just in case an end manages to come off, (shouldn't) but that way less chance of it shorting out.
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