I'm tending to use solid (plastic) carriers with a top opening door for rabbits. It's easier to lift them in and out at the vet, or they can be examined / injected in the carrier if they really can't be handled. Rabbits can hide at the back of carriers with just a front opening door, and getting them out can be awkward and not a good experience for the rabbit.
I wouldn't use a soft (bag-like) carrier for a rabbit as they may chew their way out, and are at more risk from other animals eg curious dogs in the waiting room (when we are allowed to actually wait in a waiting room again).
https://www.petplanet.co.uk/p15663/...G42vY30z8JnHMBN33LsWHkJIMCaL02Q0aAiXUEALw_wcB