The ones sent to me in August 2017 came with no formed sides. Flat sides only, so easier to scoop and clean! Hooray! Maybe they listened to their customers and went back to the flat sides? Whatever the reason, I'm glad mine were flat. You can't pick colors but the ones sent to me were decent if not my favorite. Here's a photo of them (in blue and raspberry pink) next to a very large gray litter for size comparison (bought elsewhere) and my 19 lb cat. For some odd reason, my cat prefers small litter boxes, so he's happy with the size. I wouldn't go any smaller for an adult cat and that would be too small if your cat needs a lot of space to do their thing. Ideal if you're short on space because it's big enough to have enough.
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