I love this pack. It is cavernous, easy to fill, comfortable and looks pretty nice. I use it with a 3 litre Osprey Hydraform, which is a good fit, snuggling between the backframe and "airflow" mesh.
The backframe means that you forget how heavy the pack is (something which it is even when empty) and get used to carrying loads in. It's always surprising to put the pack down after carrying it for a while and then pick it back up when you realise that weight has been on your back for the last few hours.
My only gripes are that the top pockets are too large, encouraging you either to stuff them full and make the bag top-heavy or leave them empty which makes the bag look somewhat deflated.
The second and main gripe is that - like with the 50 litre Atmos - it doesn't stand up. It's even difficult to lean against a wall or your legs, which is annoying when trying to fill it. Because of the curved bottom and backframe, it's like trying to lean a banana against a wall. It sounds minor, but it drives you crazy.
Sadly, I left some peanuts in the mesh hip pocket during a trek in Borneo at a jungle camp. The rats lacerated the mesh and made off with the peanuts and half a packet of ibuprofen....
(Written by: magicguppy)