These bags are really strong and fit out litter tray perfect although a deep tray may not work.
My cat has on occassion managed to tear a small hole where she persistently scratches and digs but only on occasion and the bag is still strong enough that it doesn't tear when lifting.
Very strong bags that my cat hasn't yet managed to destroy. They do fit a deep-sided litter box, but only just. If they were an inch bigger they would be perfect.