Bryan, most people use the 4.5 inch 16 oz. delis. I got three females shipped to me a couple years ago that were about 200 grams each and fit in the 16 oz. They were kind of cramped, but they do fit. 150 grams and smaller, easily in a 16 oz. I prefer the 6.75 inch 38 oz. They give the snake a little bit of room for a possible long trip. I would go eith the 38 oz.