The major anchor force is by applying a thin, fast drying super glue to the end portion of the loop to the inner case surface. There are a dozen ways to anchor or secure the loop, once inside, be generous with the glue.

They're easy to attach to the leash and easy to cinch up on your wrist. They allow you to use both hands -- when fumbling for keys or using a flashlight while picking up dog poop. Plus this includes 3 - different colors.