ok, if you look at the pics in that album i posted, the bivy and green bag is in the little camo bag on the bottom. thats the one held on with the black straps.
ok, so ya got that on the bottom. those pics have it mounted on a molle frame but the medium alice has slots on the bottom that straps will go through and the alice frame has slots that the straps will pass through to secure the compression sack on bottom.
stuff the black bag into a compression sack and load it on top of the pack.
i personally havnt done that but it should go on top of the medium alice with no problem as long as its strapped tight so it doesnt wobble.
a poncho and liner and/or a blanket can be rolled into a tube and attached up the sides and across the top of the frame kind of like the pics you see of the old time soldiers with the bedroll rolled and bent over the shoulder. by the way, you can roll stuff up inside that roll.