We’re guessing that the original beach volleyball was just a volleyball that someone took outside on a nice day. This is because the size and weight of both are so similar. The weight for both is around 9 ounces. The circumference will also be between 26 and 27 inches, except for a youth ball, which will be closer to 25-26 inches. The main difference you’ll find is that beach volleyballs tend to have more durable cover materials to handle playing on the sand. Some also come with a measure of water resistance as well.