Made from ABS plastic, and with strong and secure magnet closures.
Reliably protects 4 20700 Batteries. Can also be used for 18650s, with a little movement.
We have had some customers report the ability to use with 21700s, however depending on your battery, you might not get a good fit.
Flask style and smooth edges, the shape conforms to your leg, allowing you to carry your spare batteries effortlessly and comfortably.