My LO got these for Christmas & loves crawling & climbing on them. He also LOVES crawling through things, so we used the box his car seat came in set it up like a tunnel with these inside (so he crawls over them as he crawls through the box). Well the box is starting to get pretty beat up (not to mention it looks kind of junky). & I'd like to get him something that does the same thing but is more permanent. I thought about those popup toddler tunnels, but all the ones I'm finding are round & idk that they would fit well inside. They are 16" wide & 6 " tall. If you have ideas it would be greatly appreciated!