Zip or cable ties. You may need to drill a hole in the plastic portion of the carrier. They make zip ties that are reusable so if the cats need to be removed somewhere along the way, they can be resecured when they are put back in.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...