Battery Silicone Sleeve
If you use Mods with 18650 batteries and you take a spare battery out with you, this is a great little battery case. The battery conveniently just pops in and out of the sleeve and will prevent your battery from getting scratched or shorting on something metallic in your pocket.
Made from silicon with a key chain loop, these are great for protecting your 18650 batteries if they are loose in a bag or in your pocket.
Please note: Colour might vary slightly from the image.