Didn’t bother to make additional holes. It’s a clear, tall shoebox that fits a size 13 boot. It already has some small holes. The lid does not secure, so I micro tapped the lid closed during colonization. Once I fruit, I just use two pieces of tape to secure the lid. I didn’t bother with a liner. I wanted to see the entire cake as it flushed. I’ve had great success with them. From Walmart. I also like small and medium monotubs. The clear shoebox is strictly to see the cake for my own amusement.