Bánh chưng molds are typically handmade structures, made by joining together 4 pieces of wood to create a square frame. Alternatively, you can make molds out of an empty 1/2-gallon milk carton. Simply cut off the bottom and gabled top of the carton. Flatten the body of the carton and cut it into 2-inch segments which will act as makeshift bánh chưng molds. When you’re done making bánh chưng, simply recycle the carton! Settings may vary on your Instant Pot® depending on the model. Please refer to the manufacturer's guide.