If you're looking to purchase the DJI drone that's most portable, your solution is the Mavic Air. This drone folds up into what is by far the most compact package that DJI offers. This little drone is also super easy to get up in the air; it can be unfolded and ready to go in no time. The Spark is a close second, however; the only pitfall with the Spark in terms of portability is the fact that the arms don't fold.