I see a few 'age related' posts and can totally identify with that. I have posted in MYOG inquiring about making inflatable - cushions, pillows - and chairs? Here in NZ there are usually some natural features that offer a seat or back support - but... the bony bits do ask for something in between.

Does anyone have any recommends on inflatable cushions or pillows?

As for carrying an actual chair - old knees insist everything is under 10kg - so... no chair.