Oh whilst on the subject, i have to just say that i wouldn't recommend a Savic 'Trotter' front-opening carrying box for a big rabbit like a frenchie.
As i found out one morning when were boxing them up to go to a show, the sheer weight of the frenchie meant the bottom section pulled away slightly from the top section, causing the wire door on the front to literally just drop out of the door-holding slots!! (not kidding!!)
End product is frenchie fallen out throught the front & onto the ground!!
Although the box has the size, its misleading because it doesn't seem to cope very well with the weight aspect, & the gravity caused by a big bunny causes the door to drop out.