I've had a ferplast atlas mini and currently have a Bracco 80 for my trio. They're very large and cumbersome carriers but I've found them excellent for getting the rabbits to go in to themselves and they seem generally more comfortable with this type than the normal type.
They both weigh about 5kg on their own, maybe 14-15kg with the buns in but I find them relatively easy to carry. Bulky more than anything.