I'm going to Kansas for 2 weeks and my bunny is going to stay at my mom's co-worker's house. He's going to stay in an x-pen. I've been putting him in there to get him used to it before we leave because he usually stays in an NIC condo. I have a box in there that works as a hidey house. He likes to jump around on things, but he can't seem to jump on the box easily. I was wondering if there was any way to put a shelf in or something like that or if I should just put in a smaller box that would be like a step.
Here's a picture: