Very similar to money bags but larger,made of calico.I get mine when I buy crix in bulk.
I usually have too many so I try to pass them on because I hate waste
Www.prospectors.com.au have the side tie and draw string calico bags. I prefer the side tie ones but they are harder to find these days. Id you do a general search for calico bags or sample bags you will find them. You can even get themm the size of a pillow case.
I just get good quality pillowcases from Good Sammys or the Salvos, usually 50c each, and a lacky band around the folded-over neck. Drawstring bags are never secure enough unless you also use another tie around the top. Always a good idea to turn them inside out in case there are loose threads on the inner seam which might cause tangling and strangulation.