13-Pocket Expanding Spiral File, Letter, Foam Poly, Navy Blue, Sold as 1 Each Moisture-resistant foam polypropylene expanding file with multiple pockets, easy-access spiral flap, 4"" capacity and elastic cord closure. Lightweight, flexible and textured poly is moisture-resistant to protect your documents. Spiral flap stays out of the way for easy access. Unique expanding bottom slides out to 4"" wide for more holding capacity. Secure elastic cord closure.