the cfp 90 is a huge pack with the removable patrol pack attached. the bottom compartment will hold the ecws patrol bag and the ecws bivy but it wont hold the thicker intermediate(older is black dont know new color) in that bottom pocket.
it has a hell of a good set of straps and the waistpad is very good. the straps adjust up and down but have to have a screwdriver to do that.
ive carried one short distances loaded about medium weight and it fit like a glove to my back.
most places want too much for them. last winter i was selling them as fast as i could get em out of the storage box for 75 bucks but they are all gone now but one i kept for personal use.
if you can get one cheap, go for it but there are civilian packs just as good.
suggest lookin around for the marine issue arc teryx(spelling?) that has been hitting surplus market for fairly cheap.
you can put a medium alice on a newer molle frame just by using a little strap to the frame from where the shoulderstraps usually go. large alice would have to have the frame modified like the above posters pictures show.
here in the following link is a couple of pics of a medium alice on newest gen molle frame with stuff sack on the bottom of pack which holds the military bivy and green patrol bag. this setup would have to have the black intermediate bag attached seperately. also note that the addition of the shovel in the pic precludes the use of that middle pocket. i doubt anybody carrys a shovel like that when traveling like you kids do but its great for short overnight hiking.
http://squattheplanet.com/useralbums/travelins-pics.122/view