I had the chance to create a «kitten castle» out of cardboard boxes for one of my kitten pods. (catdepot.org)
Unfortunately most pizzas that kids are exposed to at parties or any standard gathering in western culture has possibly come out of a cardboard box housed in the frozen food section of the supermarket. (superchargedfood.com)
You should avoid pet carriers made of cardboard as they are only good for temporary use. (choosehamstercages.com)