Huh... ?
Just like my husband and I each have a bag with 3 days worth of clothes, personal care items and various emergency supplies (flashlight, radio, maps, etc), I made one for each cat, with food, grooming supplies (they have high maintenance fur), a blanket, copy of their health records, some toys, disposable litter boxes and a pack of kitty-wipes. If ever have to evacuate, our kitties are coming with us.
"Bug-out" bags are kits made up with essential items so that you can evacuate at a moment's notice, without having to go tearing through the house, trying to find everything you'd need. It's advisable in likely target areas with large populations, that would be extremely difficult to evacuate in a timely manner.