The G1 cases have inspired me to make similar cases for my ponies. Buying enough of the official ones to hold everyone I have and plan to get would be greedy, plus I want to make ones tailored to kinds the official cases aren't as well suited for (Flutter Ponies, for example) as well as specialty cases (such as a Megan and Sundance case).
What I want to know is, what material are they made of? Is it just laminated cardboard?