Jim SHields asked, >I'd be interested in finding a source of such mesh bags. Go to any large fabric store and you will find mesh fabrics in all sizes of mesh. Making the bags could not be simpler for anyone with a sewing machine. If that's too hard, muslin drawstring bags can be bought from geological and mining (prospecting) supply shops or websites; they're used for samples. From such suppliers you can also buy all sorts of useful things such as sieves in many sizes, strong cheap trowels, and detailed back-country maps. Jane McGary