First of all, I want to thank the person who originally mentioned Sadie's bags on this site. I contacted them and am already on my 4th bag for them. I also intend to send them some of my charity quilts. Next, I have not had any trouble sewing through the bulk. I have various Viking machines, but I use my little Brother on these and it glides right through. I use the Pellon type that came with the first kit and it does not seem to be too bulky. Hopefully it is not something with your machine.