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For off-road backups when pack-size is an most important factor I've looked at these and the other "tube alternatives". Chatter up thread innit.
https://bikepacking.com/gear/tubolito/ but https://www.ianslack.com/cycling/tubolito-review-bad-luck-or-a-bad-product/
https://bikepacking.com/gear/schwalbe-aerothan-tubes-review/
https://revoloop.com/mountainbike/16/revoloop.mtb-ultra?number=SW10016
rebrand innertubes as tubePLUS,
sell it as cool new technology which allows one to mount tyres easier, no gunk to deal with, fix any puncture in 2 minutes, able to swap tyres whenever the mood changes, no faffing with air compressors
"i have had tubeless, but honestly, would choose tube plus every time, my thumbs love me" - person who rides a tow path once a week