I was carrying a foldable campstool for a bit, but like others, gave it up due to weight considerations. Also, the campstool caused me to bend over often, causing additional back pain beyond the long hike.

I met with a father & son on a trip when I was out SOLO and they each had a lightweight REI foldable chair which allowed them to lean back and relax. I hid my jealously, but I was JEALOUS.

The lightweight foldable chairs I've found are a bit expensive. I've never owned any REI gear, and I assume those were probably pricey. But I think I might decide to save up and pull the trigger early in 2020.