CapKeeper 2 with:
CapKeeper 2 Lens Cap Strap
Never lose your cap again!
The CapKeeper 2 is an elastic loop that wraps around barrel of your lens with an elastic lens cap leash. It prevents lens cap loss with an adhesive-backed disc that securely attaches to the lens cap.
The CapKeeper 2 is designed for cameras with interchangeable lenses and video cameras.