“Battery socks”. I like that term.I will double up on the doubling up. I the main battery sites all give plastic cases, but they can pop open. I got a zip case from 18650batterystore.com they said fit 2 21700, but I can get 4 20700s in it. It was like, 2$, and a five pack of silicone battery socks from fasttech was under 5$.:
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