I recently purchased a Four Sevens MX3F along with a spare battery. Battery didn't come with a case, just packed in a cardboard box so I'm on the hunt for a 26650 waterproof case to transport the spare safely. Did a search for "26650 battery case" and the results were... underwhelming. Checked at countycomm, overready and darksucks but no one seems to be selling waterproof cases for this battery size. I'm a fan of the "delrin battery lockers" that OverReady and CountyComm sell, but none of them offer it in this size. Anyone else have any luck? Little help please?