DW and I use portable collapsible chairs regularly during the summer for Ravinia and Botanic Garden events. The chairs we were using left us with aching lower backs because of the bad posture. This spring I went out and looked for a portable camp chair with lower back support and found The Strongback Chair Strongback Chairs — Welcome
We each got one and used them frequently, often 5+ hours at a time. What a difference. Anyone with similar needs should strongly consider this option. Not one ache. My brother and his DW also bought a couple and are also happy.
That said, a couple of critical observations. It is heavier and bulkier than most other camp chairs, not as portable as it seems. I can carry both but nothing else. Armrests are a bit harder. Not sure how well it will hold up, but construction looks solid and the fabric should last.