This info may be a little out of date due to the age of my Osprey stuff, but I have a Solo (smaller version of the Daylite) that came on my Osprey Crescent when I bought it back in the day. It's a cool little pack, and really nice if you want to setup a base camp and do day hikes from there. I have used it on my Aether 60 before, but I think in covers the big mesh pocket if I remember right. I should also mention that my Aether is an older version ('04 I think), so I am not sure how it fits on the newer ones. One other thing to consider is weight. The Solo is about 12 oz, and the Daylite is bigger and beefer so I assume it weighs considerably more.