>>545923503
No jump pack is necessary, you can even be below the enemies that you're airbursting g.e. the bile titans. You just gotta cook it for 3-4 seconds to make sure it's off of the ground (at least a meter) when it explodes. You really don't even need to have good angling or game-sense.
Give it a go, you will probably have fun with it. The only real downside is that you can only carry three without the engineer kit.