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If it's a choice between carrying an inflatable pillow that weighs almost nothing, takes about three breaths to inflate, rolls to the size of a jumbo gherkin, and is comfortable to lay on... Or unravelling your neatly packed inner tube, pumping about fifty times with a mini pump, stuffing it in a bag, then spending ages squeezing all the air out and trying to neatly and tightly re-roll it again every morning... I'll take my inflatable pillow. :)
Just suggested a bikepacking hack of inflating a spare inner tube inside a bag to serve as a pillow. My companion for tonight's bivvy is now trying it out. I've told him I'm taking no responsibility or f he wakes up with a presta valve stuck in his ear...