Chowder
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This is just a tip I've been using for a long time. Airborne tubes are PERFECT for safely carrying 18650 batteries. The batteries are held without rattling due to the plastic spring in the top cap. So, there is no extra ware due to it bouncing around in the tube! So, don't throw out the used tubes after using all the Airborne, repurpose those and never worry about thermal runaway in your pocket or bag again!