Zooplus is reputable. I wouldn't recommend a bag type carrier though, for two reasons. First, bunnies can chew through fabric incredibly quickly if they want to, but maybe more crucially, a bag carrier isn't going to provide your bunny with any protection if you happen to come across a dog while on the way to your dads (or at the vets, or wherever you use it). For the sake of something that is a bit of a pain to store, I would definitely recommend you get a good solid carrier that is much safer for bunny. Depending on where bunny lives, you could always get one where the front comes off and then it can be put into bunny's normal house as a 'den'. That way, the carrier is familiar to your bun when they need to go in it, plus you don't need to store it anywhere!