Great big box, but has weak bottom for large cats
I had to take the filter and second box away as even the single one is bending when kitten goes into the box. With the 2 extra bits it was bending much more. It is an XL litter for big cats, mine is not 5kg. I need to find something to place under it as he does not really feel secure and his legs are slipping sideways when he squats. However the high sides are really work as magic, the digging stuff does not end up all over the floor, really just a few pieces which comes out when he jumps out.