Montblanc x BMW Activity Key Set
The fob for the new BMW 5 Series Sedan is less of a key and more of a transmitter. At roughly 2" x 0.75", it's tiny enough to be carried in a variety of ways, and the Montblanc x BMW Activity Key Set gives you a couple. A watch-quality black cowhide leather wristband lets you keep the key on your wrist, while the metal key fob makes it easy to keep it attached to any legacy door-openers you carry around.