after being stuck on a stool again, while in-law took up the sofa’s yesterday evening, I was driven to contemplate this (again), as my back started aching.

Does a comfortable fold up chair exist, with good lower back support?
I have some cheap and nasty (uncomfortable) ones for camping but there rubbish after more than 10 minutes (if that).

bit random and only viable if you can put up with green but a specialist fishing chair will do it. You can get all sort of adjustments and lumber support, they are designed to be sat in for extended periods of time.

They usually all have extend able legs so you can raise it up from the usually low position preferred by anglers.

I can put up with green for comfort, didn’t think about anglers, was looking more camping centric.
Good call, cheers