I just wanted to chime in with a recommendation for the reo. or even the reo mini. Its small enough to fit your uniform pockets and little to break in a tumble.
I personally use ego type batteries and while there is nothing wrong with them and I recommend them to a lot of people - they can be too long for a pocket and if you get a tank - the tank can easily break if you drop your e cig (ask me how I know)
The reo will also give you a very long lasting battery and spares are small and also easily carried if you find you need extra (just be sure to get a plastic battery box as loose batteries are dangerous if the connect with metal in your pocket).
I personally use ego type batteries and while there is nothing wrong with them and I recommend them to a lot of people - they can be too long for a pocket and if you get a tank - the tank can easily break if you drop your e cig (ask me how I know)
The reo will also give you a very long lasting battery and spares are small and also easily carried if you find you need extra (just be sure to get a plastic battery box as loose batteries are dangerous if the connect with metal in your pocket).