IPX 6.5 Waterproof rating (1m of water for 20 mins; Dustproof); Secure latch closure; Magnetic swing leaf's; Bombproof shell; Most compact and user-friendly storage for flies 8-22; FlyTrap for offset storage without head/tail overlap; Angled entry points for easy load of flies; Maximizes capacity and organization; Deep gutters to protect and preserve fully hackled flies; Lightweight - 25% lighter than Silicone counterparts