Dogtrousers
Kilometre nibbler
I've got a Topeak defender on (or not on) my fixed gear bike. Clips quite easily on and off the seat post.
https://www.sjscycles.co.uk/mudguards/topeak-defender-xc11-29er-rear-mudguard/
https://www.sjscycles.co.uk/mudguards/topeak-defender-xc11-29er-rear-mudguard/