A Tacky Day Pack Fly Box 2X measures 5 x 3 ⅛ x ¾ inches and holds up to 360 flies. Yes, you read this correctly! The double-sided patented silicone anchoring system in the Day Pack Fly Box 2X can hold nymphs, midges, emergers, and small dries to attain that total fly count that can fit into the pocket of your shirt or wading shorts. Closes with a magnet and holds fast! Bring all of the fly selections you could possibly ever use in the minimalist, durable, and secure Tacky Day Pack Fly Box 2X!