You can also buy a base shaper specifically for speedy on eBay. Just go search 'speedy # base shaper' should be $15-20. But I just got a 2mm thick cardboards and sew a bag for the cardboards. You can buy different types of material and cardboards at craft store.my monogram canvas speedy 30 will be arriving soon and i've heard and seen that these bags sag. is there anything i can do to it or put in it to keep it from sagging?