Root Co. Mag Reel SQR
This accessory from Japan’s Root Co. clips onto your belt loop or bag strap and holds gear weighing up to 7.5 pounds. It also has a built in magnet, and its retractable tether can extend up to 33.5″ – though load-bearing capacity is reduced with the line drawn out. They also make a smaller model, the Mag-Reel SQR Lite and a round version with a carabiner clip.