I love this tank and the coils are very good but it's a shame that freemax in there infinite wisdom decided to make it a sliding cap, the cap is not tight enough to stop leaking however, if you want a leak free experience just put a vape band on, get one that's a little wider than standard, now I've tried this solution and it works but I'm using the bubble glass and I mean bubble, the band sits nicely resting on the glass but also sits above and holds the cap in place, no more half a tank in your pocket, and then enjoy