Make a pattern of the bottom of the purse and cut one out of cardboard. Cut some batting to fit with 1\2” all around cardboard. Lay out the remaining material. Lay batting then cardboard on wrong side of material. Trim so about 1\2” of the material remains around the batting’s edge. Pull edges over and glue in place using tape to hold until dry.
When bottom is dry, remove the tap and glue to the bottom of the purse, right side up.