Zong zi is typically wrapped in bamboo leaves (I make about 60 every year), although a version using banana leaves is often used in dim sum. Also, zong zi typically do not have a triangular shape, but they have 4 points (imagine a twisted rectangular pouch). Rice wrapped in banana leaves can be found in many cultures, not just Chinese, namely Caribbean cuisine. The fillings and type of rice vary depending on the recipe and culture. Zong zi is filled with sticky, glutinous rice and either soy sauce, fatty pork, and sometimes mushrooms (eastern Chinese style) or salted egg, pork sausage, pork, dried shrimp, chestnuts, and more (southern Chinese style).