I've eventually got what I consider the basics, and it only takes up a bit more space than my tobacco, rolling papers and lighter used to (but looks way cooler). I normally carry one cig in my pocket for vaping in the car, but this neat little case goes in my topbox next to my lunch tin when I'm on my bike 
- Silver EVOD tank (wife has the other with both batteries from the kit)
- Mini ProTank 2 (ver.2)
- Innokin itaste VV (ver.3)
- EVOD 650mAh VV Twist
- Both chargers (damn Innokin needs its own)
- 10ml of juice