With these basic steps, you can make any size zippered pouch you’d like. The zipper you use will determine the width of your completed pouch. Once you decide how big you want the finished pouch to be, add ½ inch to the length of the zipper (measured from metal end stop to metal end stop) to get the width measure you should cut. Add ¾ inch to the desired length—this is your length measure when cutting out the fabric. Our finished bag is 7 by 4 inches (we used a 7-inch zipper), so we cut fabric pieces that measure 7 ½ by 4 ¾ inches.