Using Paper Sacks
You might not consider paper sacks to be strong and durable but you will be surprised. Small paper bags are used in supermarkets for plain flour and sugar. In America, paper bags are used tp help you take your grocery shopping from the till to your vehicle. In industry paper sacks are used by contract bagging suppliers to bag cement, finishing plaster, tile adhesive and more. Don't discount the possibility to use strong paper instead of plastic which is bad for the environment.
Watch how to use cardboard sheet mulching to kill grass.