Cats

My cats love going out onto my balcony but I don't always love having the door open. When it's -5 °C outside and they are clamouring to get outside, I need a way to appease them. Cat owners know what I'm talking about. Anyway, those patio door inserts for a door my size on Amazon are like $150+. I have a bunch of boxes from moving and big thing of PVA glue. I think I can make something durable enough without spending very much money.