Jump Packs Models with the Jump Packs special rule can move over all other models and areas of terrain, suffering no movement penalties for doing so, such as due to Difficult terrain or moving over an Obstacle. Models with the Jump Packs special rule cannot end their movement overlapping other models, nor can they end their movement within an enemy model's Engagement Zone unless they are issued with a Charge Order. They can move over Impassable terrain but cannot end their movement overlapping it - any model that ends their movement overlapping an area of Impassable terrain is destroyed.
Infantry models with the Jump Packs special rule can only end their movement on top of a Structure if they intend to Garrison it - if the Detachment does not Garrison the Structure, then any models overlapping with the Structure are destroyed.
A model with the Jump Packs special rule adds 1 to the result of all Fight rolls it makes against models Garrisoned within a Structure while issued with a Charge Order, in addition to any other modifiers.
Models with the Jump Packs special rule count as having the Bulky special rule for the purposes of Embarking on Transports. In addition, they can Disembark from a Transport with the Flyer special rule even if it does not have the Hover special rule, and a Transport with the Hover special rule does not have to Hover for them to do so.