If you have one key to keep with you securely, why don't you carry it in a stylish key holder?
Dimension: 
Length: 3.75 " without the Swivel Clasps Lobster Claw
Width: Almost 1" 
The leather used: Veg-Tan Calfskin has long been the choice of master leatherworkers for fine, detailed carving. The smooth, tight grain of these skins is why it is preferred for small leather goods when you don’t want to cut corners on quality. 
✔ Premium full-grain Veg-Tanned leather 4oz - 5 oz 1.6 mm - 2.0 mm
✔ Hand saddle stitched with military parachute-grade thread
✔ Hand-burnished waxed Edge
✔ Hand-painted with Fiebing Oil Dye
✔ Great design and durable for everyday use
✔ Very strong construction, this will stay with you for a lifetime
✔ This is a great gift and it can put a smile on faces
✔ You will love it because it's compact and looks nice
✔ Handmade in Canada, Quebec