Grav-chute

From Lexicanum

A grav-chute is a pack-sized suspensor allowing troops to float safely to the ground from any height. Such devices can be used to drop troops onto a battlefield, either from low-flying aircraft or from the upper atmosphere. They are most notably used by Imperial Guard Storm Troopers and Drop Troop regiments, such as those from Elysia.

Sources

• Warhammer 40,000: Rogue Trader