Yes JJ good time on this one. In May I'm scheduled to do Conn and Mass on the AT. On the bottom will be a 3 season Yeti but I've got an Arc AT I'm thinking about using on top in conjunction with a WM Flash Jacket for sleep.
The layers will be Smartwool tights and a Beartooth merino hoody; which are camp/sleep clothes.
I'll also carry a pair of down socks and a Black Rock down hat.
A 1/4 inch ccf pad doubling as a sit pad and backpack frame pad (Mariposa pack) will bridge the feet to the hips.
That's the current plan for 1st of May weather in Connecticut...I may chicken out and take the 3 season Mamba.