The backPack accessory for ultraCage™ delivers a convenient and extremely helpful rear plate on which to attach camera-top accessories. The backPack attaches to the ultraCage™ rear chassis to keep accessories clear of camera operation while still providing solid and stable mounting.
The backPack is often used to attach a battery plate/battery combination to power the complete rig (the Redrock powerPack is a great accessory for powering multiple camera-top accessories as well), or used to attach an external recorder in a place that is easily accessible and viewable.