Make them out of feed bags, hessian bags or plastic (polypropylene) sacks. If you have only the plastic open weave type bag, put one inside the other. Don’t use kitchen rubbish bags as they will slip around in the water and may split.
Sandbags are available from:
Address: 55 Byron Street, Sydenham
Phone: (03) 961 3535
Opening hours: 8am to 4.15pm Monday to Friday