Eleaf iStick 20 watt
Eleaf iStick 20w yet fits in the palm of your hand with room to spare. At 75mm*21mm*32.8mm it is a very small and light mod with 2200mAh battery which can be used while passthrough charging as well. 510/eGo fitting including adapter and charging cable. Kit does not include atomizer.
The perfect atomiser for this device can be found here