These 2oz paper cups are great. I use them for my pet gecko's food. I was getting tired of washing out tiny plastic cups all the time, so these are a real time saver (and sanity saver) for me!The food my gecko eats is powder mixed with water to form a loose paste consistency. A bit like pudding I suppose. I have had no issues with leaking or seeping. The cups do not deteriorate and they hold their shape. Most importantly, my gecko is happy to eat from them!Before I used these cups, I tested one out by filling it with water and leaving it on a paper towel. After 8+ hours, there was no leaking and the paper towel underneath was almost 100% dry. There was minuscule dampness directly underneath, but nothing major. Certainly nothing for me to be concerned about.I will absolutely be buying these again....in about a year when I've used them all!!