On flights, a pack of good wipes, like Wet Ones for Pets, can help clean up accidents. I bring a small package of 30, so it doesn’t add too much extra weight in my backpack. For cats, a portable litter box will come in handy in airport pet-relief areas, but keep in mind these are typically very small. Make sure you pack some of your cat’s regular litter in your carry-on, in either a zip-top bag or doubled-up grocery bags (you don’t want to spring a leak), and get some liners for the box as well, to make clean-up easier. But of the three cats I’ve flown with, only one has ever been brave enough to use the litter box at the airport. The other two usually tried to hold it until they felt totally safe, but on extended journeys, they weren’t always successful.
