Starbucks Pet Bottle Cover for 480-600ml Bottles **Features an air hole.** & There is a small air hole (approx. 5mm) at the bottom to make it easier to insert pet bottles and water bottles. This is not a defect, but rather to prevent air from getting in the way when inserting them. ★ Please note that this is a foreign product, and there may be some minor imperfections. Please be aware of this before purchasing.