I made mask bags with the 500D Cordura for my son's volunteer fire department. It is difficult in that the lining on the fabric is sticky and the needle wants to stay in it when you stop; don't use the needle down option so that each time you start with the needle in the up position. I used a denim needle and had to play a lot with the tension. All the web sites and you tubes will tell you to use an industrial machine, but I did get it accomplished with my DSM.