Lanyards are worn around your neck and used for such things as ID cards and keys. For light use they can be made adjustable from a single paracord. However they can be made to hold a dozen or more keys.
An adjustable lanyard. Two separate strands & colours. The 2 ends (with Capuchin Knots) are joined with a Fisherman's Knot, which allows the lanyard to be shortened if required.
Beginning with a Lanyard Knot, then a short section of Square Knots, finished with 2 Cobra Knots. Length is about 19" when closed.
This one is made from 4 paracord strands in a round braid to hold several dozen keys. The loop is about 14" stretched tight, with a 3" backsplice and additional brading at the business end.
This one incorporates a Lanyard Knot plus some braiding. The braid is one I developed and call 'Overhand Braid'.
A longer one, single strand with another softer material braided for comfort on your neck.