Not sure how legal this would be in a race though. 
http://www.iflscience.com/technology/jetpack-aims-help-soldiers-hit-4-minute-miles
This is ST. That thing had better get made out of some sort of carbon fiber before we’ll even consider it.
Try to hide it under your shirt for the next 10k, or better yet, stash it in your back and sling it on in T1 of your next tri. I bet the gains would be better on the bike.
I realize it’s an early POC, but using a jet backpack to go from 5:20/mile to 5:02 seems, well, meh.