The amount you can fit inside will depend on the size of your blueberries (I was able to fit 2 tablespoons of filling in each hand pie). (pastryaffair.com)
About the size of a blueberry, it's supposedly one of the most super of the super foods with even more antioxidants then the famed acai berry we hear so much about. (bluejeansandcottontees.com)