They are great size wise and certainly cheap. The only issue is that cardboard hides can build up bacteria rather quickly. All of the stuff that we wash off of our plastics hides do a number on these. In a pinch they will do the trick short term, but I don't know if anyone has used them long term. I remember using them when I unexpectedly took in a young bp a few years ago, but I quickly switched to a plastic hide. Now I just use a layer of loose newspaper and they can pick any place in their enclosure and still feel secure. It gets changed out when the rest of the newspaper get changed.
I will say that if you blow your nose a ton you may be able to keep up with the demand and keep fresh ones in there![]()