Hand-in-hand with the capping machine comes bottle caps!
Within the last couple of years, bottle caps have made a leap from plain and ordinary to fun — and useful. Various online services will print custom made caps, based on your uploaded image.
The super-handy thing about custom caps is that, assuming you print different caps for different meads, you can tell what brew is in your bottle at a quick glance.
Depending on how you bottle, caps might be “necessary” but custom-printed ones definitely fall under “fun but superfluous”.