I am a landscaper and carry mine in my pocket and truck all day. It gets banged around and tossed and dropped all the time. It has not leaked a drop or broken yet. Actually, I had one break, I stepped in it, but that's the only one. I have 4 in rotation, each with a different flavored juice. I carry all 4 of them during the day. I refill 2 of them every day, sometimes twice, and the other 2 every 3 days. These are the same ones I started with 3 weeks ago and are still performing great. I haven't even cleaned or dry burned one yet. When it gets 3/4 empty, or in the morning, I too it off.
When you figure that the one that I use for mint has been refilled at least 30 times, that's great. I would have thought that sticking the needle in and out would have caused the needle hole to get bigger and rip, but it hasn't and still doesn't leak a drop.
Also, you can fill them/ top them off, without emptying it and opening up. I posted a video teaching people how.
How to refill a Phoenix cartomizer - YouTube
Thanks, a "tank" that I can cary around in my pocket without fear sounds great. I'll have to try them out.