The Umpqua UPG Foam WP Essential Medium is a waterproof foam fly box sized for flies 8–22. Umpqua lists it with an IPX 6.5 waterproof rating and a secured latch closure to help keep water out.
Inside, magnetic swing leafs increase storage without adding much bulk. Deep gutters add clearance and help protect flies once they’re seated. At 6.25" x 4.5" x 1", it’s a compact medium box that fits easily in a pack or boat bag when you want sealed storage in a smaller footprint.
