I love these trays and like several other reviewers, I fill several at a time with about an inch of old fashioned non-clumping clay litter and stack them in the cupboard. Every day, I throw out the used one and set down a new CLEAN. The cat is happier and I'm happier. No more scooping; no more scrubbing the litter box for me and no more walking around the box or trying to stand on the edge for the cat cuz she can always find a clean spot that suits her. These liners are cheap enough that I can throw one out every single day. Alternatively, I can use clumping litter and scoop it as usual and then throw it out every few days but my goal is to not scoop so I use the cheaper litter to keep the cost down. Yes, these are thin and as many others have suggested, don't put too much litter in it because when you pick it up, the box will bend and litter will pour out. My cat only likes her litter about an inch or so deep so it works well for us. No, they are not especially deep so if that's a concern for you but your goal is to not have to scoop dirty litter, then you could use these inside a taller box.