wing chun wallbag

any one can say how to make a wing chun wallbag?

I know the best option is to fill it with beans but can't give you more guidance

You can buy a canvas bag at the local martial arts supply store, or maybe at an army surplus store. Fill it with beans (dried not cooked!), or cat litter, or playground sand.

You may want to use a plastic garbage bag as inner lining, to prevent dust from flying out when you use it. If the canvas is too rough for your hands, put the bag inside an old t-shirt.