I made a sleeping bag type thing for my guinea pigs (which I am VERY proud of because I had no idea what I was doing

) I have seen a lot of pictures of guinea pigs on here with them but mine always go into them head first and put their heads in the back of it. It makes me nervous because it seems like it would be hard to breathe. Should I take this out of their cage?
This isn't the one I made but the sleeping bag I made looks like this:
Cletus in his new sleeping bag - Guinea Pig Cage Photos But my pigs don't sit in it like this.