Now you have lots of choices!
So small, portable, moderately powerful, and direct lung. No giant clouds, but not tootling either. For small and versatile mods, the Pico is always a winner. One replaceable 18650 battery, 75W, fits tanks up to 23 mm in size. Another single battery solution is the Coolfire 4 18650 edition which is also 75W on 1 18650 replaceable battery. It can hold larger tanks, but it's also larger in your pocket.
A bigger, but still small setup, might be a 2 battery Alein kit. Very tiny for a 2 battery mod, great screen, looks and feels good, and the baby beast tank it comes with can make some nice clouds. It can also take larger tanks, so no limitations there either.