This is a new purse pattern that I thought was unique in that it uses plastic canvas as part of the interfacing. Now if you have been into crafts you probably have some of that plastic canvas hanging around, you know the stuff that was made into everything you could think of---notepad holders, flyswatter covers ,christmas ornaments, etc., etc. You still see items made from it at craft shows. That's the stuff you use to made the bag have some shape. You also use "Decor Bond" interfacing.