http://www.walmart.com/ip/Suncast-Deluxe-Personalized-Pet-Carrier-with-Snap-on-Food-and-Water-Tray-Multiple-Sizes-Available-Dogs/9606593This is the carrier I use for my 6 lb girl sunshine. I love it i put some newspaper down and her pink blanket and off we go. they have different sizes and they give you stickers to put your pets name on it. I love it and so does my bunny!

My only concern about that particular carrier is the open front. Even my bigger bunnies could wriggle out of it. Is it open like that constantly or does it just look like it is in the pic? 

Edit: I looked at is closer it looks like the front IS covered. So I think it would work fine. The carrier I mention below is 21″.  

I use this carrier for my bunnies (but I bought them locally at a lower price):
http://www.wag.com/dog/p/petmate-two-door-deluxe-kennel-peacock-medium-430809?site=CA&utm_source=Google&utm_medium=cpc_W&utm_term=FPS-16309&utm_campaign=GooglePLA&CAWELAID=1418923358&utm_content=pla&ca_sku=FPS-16309&ca_gpa=pla&ca_kw={keyword}

It’s not fancy but it gets the job done. My two smaller rabbits, 6 and 7 lbs, fit in it well enough together. It’s snug but they’re not smooshed. You don’t want them to have too much room to move around during transport. I’ve had them for a couple years and they’ve held up nicely.

I deliberately got a very small carrier with no bars for Porky.  I didn’t want him periscoping and falling over if I had to stop short.  I also didn’t want him holding the bars with his teeth if I took a tight corner.  I knew someone whose bunny developed malocclusion when her rabbit’s teeth were pulled out of alignment that way.

This is like the one I have for Porky.  

Also, I think each bunny should have his/her own carrier.  If you are in an accident they will not be thrown into each other that way.  I try to think of my bunny’s carrier the same way I do my child’s carseat/boster, as safety equipment not living space.

I am a fan of the carriers that open on top and in front too. It is much easier to get bunnies in and out. I recently purchased Petmate Two Door Top Load 24-Inch Pet Kennel for my bonded pair and am very pleased with it. I think a bunny could easily hop out of the one you linked to unfortunately. You also don’t want too large of a carrier, they are happier in a smaller one where they have enough room to fully flop, but not much more than that.

I think I might have the 24″ one but I think width is more important then length.