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@hippy
Also, Revoloop are meant to be very similar to Aerothan and have also been around at least a year:
https://weightweenies.starbike.com/forum/viewtopic.php?t=151678
https://revoloop.com/mountainbike/16/revoloop.mtb-ultra?number=SW10016
Anyone WITH EXPERIENCE care to comment on them (the fat ones, specifically for reducing pack size of spares for my gravel bike)?