We highly recommend this 2.5 Amp 5V DC Power Supply for the Raspberry Pi 3
Power your Pi with a wide range of input voltages from 3 to 16V!
Serious power for your Raspberry Pi when you're on the go!
Add a tiny yet convenient power switch to your Pi with OnOff SHIM!
A USB expansion device If you want to have more USB devices connected for mobility
Great for powering your Raspberry Pi on the go.