Top-entry
This configuration has a few advantages. If your cat scratches and scatters litter everywhere, or your cat sprays or pees sideways, the top-entry configuration will be your best bet. The top-entry liner (Type-C) is 14.5" (36cm) tall around the whole circumference of Modkat XL. This ensures that anything your cat throws at it remains inside.

Front-entry
If your cat is obese, elderly, disabled, or just stubborn and refuses to use top-entry, then the front-entry configuration is right for you. The front-entry liner (Type-D) is also 14.5" (36cm) tall and fully protecting three sides of Modkat XL. Additionally, the front-entry configuration incorporates a walk-off platform to keep litter tracking in check.