The Cross Jetpack is another Cross-branded mod from developer Niero. And it's amazing.
This mod gets rid of the awful pose your character goes into when using the vanilla jetpack. It also adds several other features that make jetpacking more enjoyable.
It includes a jet booster and a way to use jet assisted sprinting while running on the ground if you're into that sort of thing.
Jet Sprinter: Run with ease, reduces sprint cost significantly. Build up some speed while sprinting and jump to gain a large boost to jump height.
Jetpack Standard: The Jetpack without that boring and overpowered power armor, all the features you love, none of the hassle.
Jetpack Advanced: Combine the best of both worlds, Jet sprint for those medium gaps, and Jetpack for those high ledges.
There's also a ton of customization available to you including 32 jetpack colors and two jet colors.