Very handy for storing earplugs when not in use. A great size and good to be able to attach it to your backpack. The only criticism is that the lid is a bit squeaky when you open and close it.
I prefer this pod to the net pouch provided with the plugs. It can fit more than one pair of ear plugs and it is easier to retrieve the right colour/plug. Plyus it looks great attached to your key ring or bag. As someone else has mentioned already, the metal-against-metal noise when you screw/unscrew the lid can be grating for people with sensory sensitivities but the person this was intended for is not too bothered.
This case is a perfect to keep my calmer pro with me and safe!