Good afternoon everyone and Happy Mother's Day! I have 4 black sex link chicks that are almost 3 weeks old. I currently have them in a clear plastic 115 quart storage bin with an open air lid. They are tall enough now that when they "fly" they can almost get out. They are on a countertop in my laundry room and if they were to fly out (I only remove the lid for feed, water, human interaction but they do try really hard to "be free") they would fall about 3 feet to the floor and I'm sure die. We're looking at other solutions and at this point, I am seriously considering retiring one of the pack & play portable cribs that I use for my childcare service (I do have a new one to replace it) because it is slightly larger but more importantly much deeper(by probably a foot). If I were to put a piece of cardboard in as the floor would this work? Anyone ever done this?