What a great idea, combining two important items together.  The ILBE is USMC issue and has plenty of space, straps for sercuring and cinching, and padding.  If you have the assualt pack, it will snap into the back of this pack.  It is very heavy duty and ready for work.

The sleeping system is pretty cool.  I was expectinging something like the extreme cold weather bag I was issued in the Army, however these are not that thick.  The black bag is the thickest, the green bag is a patrol bag.  The black bag fits inside the green bag via snaps.  The bivy is huge and made from Gortex.  All of these have heavy duty zippers on the side and go down about 3/4 of the way to bottom.

I recommend these, whether purchased individually or as a package.

EDIT: Feb 24, 2013:

I wore this ILBE packed full of gear on a 5 mile rough terrain hike and it was awesome!  It felt smooth on my back and had padding in all the right places.  I just wish my feet felt as good!  It is very well made and should last me a long time, even under the moderate abuse I will put it through.  Do not hesitate to get one of these!