This Allied Eagle Industries Modular Assault Pack is a great piece for your kit. This pack is MOLLE compatible. You can mount the Modular Assault Pack to the back of your kit in order to carry mission essential items. Also, this pack is great for when you are just out and about.
There are two compartments for storage of items. The large compartment has a mesh sleeve for storing a hydration bladder or other items. The compartments are zippers and have button snap keepers on the zipper pulls to secure the zippers closed.
Also, there is MOLLE webbing on the sides for mounting extra pouches or accessories.
Eagle Industries manufactures these in Ranger Green as well as Khaki. Availability may vary.