Now that some of us who took advantage of the last drop on the Kelty pk50 has had it for some time and hopefully have had the chance to use it, I am interested in what others have to say about it.
Personally, I have mixed feelings about it. I have been using it as a day pack in the 35 liter mode and find it to be comfortable with more than enough room. I have yet to use it in the 50 liter configuration yet.
My impression of it is that it would be a little overwhelmed in the 50 liter mode, which disapoints me. Maybe if you were truly ultralight, but I packed it many times with my gear and it seemed to be at the max of its capacity.
I do like it better than my old day pack as a day pack, but I will still be using my Trekker as a backpack.