A good size for these parfaits is something in the 6 - 8 ounce range. I used these 7 ounce yogurt jars (affiliate link), which worked perfectly! I've also made these parfaits in small whiskey glasses which also worked well. You just need something that has tall sides without too narrow of an opening so that you can get a spoon in there to make the layers. A small spoon also helps when maneuvering in a small glass jar or glass. I really like these porcelain egg spoons! (affiliate link).