i bought a ferret playtent the other day and it has a hole in the top and a hole in the side. anyway i tied it to his bar on the playgym so its quite solid on the bottom and i put all his chew toys in it, (obviously only the single ones), he loves foraging in it and dragging stuff out, chewing it then throws it over side of cage and i can just pick them up and put them back in the top. it means that i can keep them all together and chico has fun with it.