A new inner tube that cost more than most tyres.

[Wooger]

To be honest if I wasn't running tubeless I might ponder something like this or a Tubilito as a spare on my bike. The extra grams are really not that important, but the tiny packsize does appeal, however, the price of these things is off -putting

They’re competing with latex tubes.

For all the people that care about the performance of their bike at all, and spend real money on groupset upgrades and carbon bits, making sure you have decent fast rolling tyres, and putting in latex tubes will make a big difference to how the bike feels - they roll so much better. And it’s a vanishingly small cost for a few tubes.

These TPU tubes are almost as good as latex, but without the annoyance of having to pump them up to pressure before *every single ride*.