Inspired by bicycle messengers and their need for hard-wearing gear built to take everything the weather, the streets, and errant cab doors opening into traffic can dish out, Courier has been redesigned with new materials a slimmer new look. Designed to wrap onto a backpack, briefcase or bag strap with the double security of heavy-duty hook-and-loop AND a matched D-ring clip. " Compression-molded EVA outer jacket for abrasion-resistant durability Wraps around backpack or bag strap up to 4 inches wide, and hangs on tight with two strips of industrial-strength hook-and-loop closure and matching D-ring clip Detachable case fits iPod classic and iPod touch Hidden zipper pocket for key, money, ID and other gear Second flapped pocket holds sync cable, earphones, whatever you need. (Some of us use it to tote our flip-style mobile phones instead.) Reflective tape accents add visibility at dusk and night-time"