You could get something like a ZMax Mini. It's fairly small and light. Unfortunately, it uses the IMR 18350 which doesn't last very long though it's doable. Sigelei also makes a mini but I'm not sure if it's available yet. As suggested already, the iTaste VV v3 is a good little device. I got one recently from Fasttech and it's been awesome. As long as you don't need to go above 5 volts, it gives you a great vape. The kit comes with everything, including five iClear dual coil cartos. It has a nice blue display which shows all pertinent info, voltage, wattage, Ohms, etc. Good luck...