One fat quarter of fabric for the outer.
One fat quarter of fabric for the lining.
A piece of wadding the same size as a fat quarter.
A zip with nylon teeth that is at least 2 cms longer than the pouch you want to make. 30 cm or 12" is okay, and longer is also okay as the zip will be cut down during construction. It is important, however, that the zip has nylon teeth. Metal or chunky plastic will cause problems.
Thread to co-ordinate with the outer fabric.