Cable holder for short data cables
(e.g. earbuds)
===

Cut a rectangle about 14×2 cm.

Fold it so it's about 7 cm long, so that
the original ends are in the middle.

For each original end, add one half of
a press stud a few millimeters the edge,
and the other half where the press stud
is touch on the other part of the strap
(that is, there will be two press stud
halfs at the middle of the strap).

Do not round the corners of the straps
as the will be necessary to get a grip
to open the cable holder. (It would also
not look as good when it's closed.)