Antigravity pack

The Antigravity Pack is used by Ranger Elites to maneuver in low-gravity or zero gravity situations. It provides excellent mobility, and in no way hinders their combat effectiveness. This pack allows Elites to easily dodge enemy fire and to get in close, or retreat when needed. They most likely work similar to a Banshee's engines, encasing the user in an anti-gravity field that keeps them suspended in the air.

Trivia

 * They are used by Elite Rangers and also by the Heretic Leader Sesa 'Refumee in Halo 2.
 * The UNSC uses less refined and less effective T-PACKs for Zero-G movement.
 * In Halo 3, Brutes use a crude version of the Anti-Gravity pack, the Jump Pack, which allows them to Jump long distences and slows them down to prevent fall damage.