Small case (83mm L x 38mm W x 29mm H) for your wired earphones. There is place for the adapter lightning to 3.5mm headphone jack. There is also a holder to keep your earphones in the case.

You would need 2 pieces of stainless steel wire diameter 3mm x 50mm L (or 2 M3 bolts) to be used as hinge and part of case lock.