Macpac Olympus, and over summer I just take the fly and my bed roll.
The bed roll on the ground can get a bit damp so my hunting mate often puts his pack liner down as a ground sheet under his bed roll.
Attachment 196084
The new ones come with tapes on the fly to keep the shape between the bottoms of each poles. I use string on my old one.
Z
ps ed to add. the rocks on the pegs were because the pegs where moving in the soft sandy pumice ground.
fly only can get a bit drafty and obviously you would not want to go anywhere with sand-fly's or mosquitos.
Fly only gives a lot more space as well.