Herb Fongwrote a review of Osprey Packs Aether AG 70L Backpack on May 14, 2017
Familiarity: I've used it several times
Since the product page for the 2013-16 version was removed, I'll be reviewing the non-AG version here, so hope you don't mind. :)
The Aether 70 is a really amazing backpack and suits me really well. I'm currently using it on my big summer trip this year, starting from Montreal and going to Helsinki, Tallinn, Hong Kong, Malaysia, Singapore, and New Zealand. I also tightly compressed a Kestrel 32 inside as I will be carrying that when skiing in NZ, and it has always been by skiing backpack for the past year. Anyway, back to the Aether, although my 19-inch torso probably suits a medium better I chose the small because I found out that when the lid is taken away, the frame of the small Aether is only an inch longer than the Kestrel of which I have used it as a carry on before. So what I did was to pack up until the top of the frame and no higher, and have all my camera equipment in the lid. I detached the lid to carry as my personal item through security, and the rest of the pack as my main carry on. And it worked! So far it has fit on the Boeing 787 and Airbus A350; however, on the older Airbus A320 (with the old interior below msn 3000) the bins were slightly shorter so it was sticking out a bit so I turned it sideways, and there was just one other bag in the same bin. Overall a really amazing backpack and it's probably the best pack of all time.
I purchased it from the SAIL in Brampton (Canada) at the end of 2016 just before the Aether AG came out, and they offered a discount because of that ($230 instead of $330 CAD). There were some changes in the AG that I didn't approve of at all, most notably the hip belt where they sewn the buckle directly into the belt (like the Kestrel) and that way you can't take the buckle out if you break it. In the 2013-16 design which I have you can take the buckle out as it is not sewn into the belt, and also the triangular design of the hip belt looks really awesome too compared to the AG one.