Many people have hiked the AT without going to ground. It's often a choice, more than a necessity.
However:
One strategy I like is using a frameless backpack like the G4. This saves at least 1.5-2lb pack weight vs a traditional pack. You can then utilize some of this weight for a contingency system.
For the "frame" padding cut up a cheap 3/4" foam pad into 10" sections. total length good for 2/3 - 3/4 coverage. Use good quality duct tape or gorilla tape to make a z-folding pad from the sections.
This pad then serves multi purpose: pack frame, sit pad, extra insulation in the hammock, and an emergency "go to ground" pad. The only real concession for the emergency pad is making the pad longer than it needs to be for the other operations. This is a minimal weight addition.
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