Jade has one too( a sterilyte bin), but i always leave the lid on(modified with a metal screen for ventilation at times she's active. i don't wanna risk anything. I know that what i'm about to say is extremely over-procautionative and has a .0000000001% chance of happening, but i wan't to risk none of these cuz i love her with all my heart. I have heard of a hedgie who did something like this but a bit less complex, and escaped. Plus, Jade does 1 or 2 of the following sometimes, and she's a smart hedgie. She could overtrun her litterbox by pushing her bowls there, making it higher, causing a ramp up the wheel, wedge her hedgie hat under the wheel so it won't turn, put her blanket on the ramps end so the steep part of the wheel has traction, climb up, and jump out of her cage. I've never seen her Jump, but still. There have been a couple modifications scince the pic, but I don't feel like typing much more.