Always forgetting where you put down your lens cap. Get a Cap Buckle and keep your cap on your strap. Cap Buckle's clever design attaches to a camera or bag strap and holds your lens cap securely just like your lens cap attaches to your lens. Cap Buckle comes in 4 sizes, each capable of holding one of three lens cap sizes: 82 77 72, 67 58 52, 55 52 43, 62 49 40.5. Note sizes marked on each side of the Cap Buckle before attaching to strap and face appropriate side out. Cap Buckle is patent pending and made in the USA.