Almost a minimum-sized darts case.
As usual darts case, of course, as a second barrel and steel darts a sub-case of the parts very useful.
Crystal one and drop sleeve joints, you can use Velcro.
Besides DART, earphones, as well as stored neatly in frisk, writer, SUICA, coins and personal belongings.
You can feel free to carry a bag or key ring on your joints, so will benefit other than the darts scene.
It is a big success as a pocket of another multicast.