In reply to J1234:
I've a couple of cheapo ones, popular in the motorcycling world. Comfortable, hard to get out of when you are old and stiff! Somehow a bit bulky when folded with the plastic bits but guess that's life.
They have held out about 6 weeks camping so far and my son and I are in the 90-100kg region. Probably get an inflatable chair next since I'm already carrying an electric pump.