Just put the first one in the tray and had no problem fitting it into the 17"Wx22Dx7" tray. I bought size XL. The sides of the box are folded at least 4 inches. The material seems more durable than what I've used in the past (like the Lawn and Leaf trash bag maybe a little stronger). Let's see how it holds up with my two cats and the daily scooping.
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