My mate who is bony and sleeps on his side got one of those flash yellow new Thermarests - packs down to a 1.5L coke bottle size and inflates up to about 50mm thick but cost him about $250.
I've got a secondhand old Thermarest and bought a cheap chinese made knock-off on TardMe - a green coloured unit with the silly name of "Freedom Equipment Chunky Stealth" but at about $50 I don't care what it's called.
It inflates to about 30 mm thick which is all I need.
I store mine flat in a relaxed state and only roll them up tight when I head out bush.
It's kind of hard to explain to someone who has never used a self-inflating mat how good they are if they've never tried sleeping on one but suffice to say they are now as essential a piece of kit to me as a knife and rifle.
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