I tried the Ajungilak inflatable pillow but despite the thick yellow custard towelling covering and enormous price, the thick heavy plastic inside is very SWEATY. It made my head boil.
I now have the Poundland pillow which is much better.
I sometimes use my tent's bag, which is a useful french bolster shape, filled with spare clothes but since that is also sweaty I wrap my walking shirt around it, which thus doubles as a luxury poly-cotton pillow slip, while I sleep in my merino. Once all that is done, I don't usually have much in the way of spare clothes left to stuff the tent bag, so then have to revert to plan A - the Poundland Pillow.
The Poundland pillow is about half the weight of the Ajungilak. I feel a twat for every having bought the Ajungilak which is expensive, heavy and hot.
I'll sell it on the classified forum if anyone is tempted!