Not true. Some
tanks are just leaky b@#$#&*ds no matter how proficient you get with them. The thing about the Lemo is that it does leak a very little but it contains the little that does in the base where you fill. As long as you wipe it out when you fill it will never drain out the airholes, down your
mod, or into your 510 connection. "Cleanest"
tank I've owned. Even the Lemo 2 isn't as "clean" as the OG Lemo and its top fill.
Edit: Even walking around with it stuck in my pocket with all the jarring it takes in my pocket...it has never ever leaked on me.