FREE: Burlap, canvas and associated materials

Hello! I am a Dad trying to teach my young daughters how to make our own clothing, food bags and catchalls using a 50 year old sewing machine that I recently acquired :) I am pursuing the zero waste lifestyle and I need to make a lot of changes. If anyone has hessian or burlap or associated canvas like materials that they no longer know what to do with or etc, I would be a grateful recipient with them in the pursuit of making something useful for our household. If that strikes a chord with you, let me know :) Thank you!