It's such a versatile accessory! I've used it to hold my raincoat neatly, to clip a bike light for visibility, to hang my cap from, to clip my sunglasses to, my torch... perfect for clipping on any item you want to have at hand, essentially. I love the range of colours (Atacama Clay is my favourite) and the excellent quality of the clasps.
I can use it with different models of Wandrd backpacks too!