Because we were always bothered by the weekly Club Mate sharing sessions in the Spaces (due to the risk of infection or general health issues), we gave the existing Mate clip designs our own personal touch. They come in bright colors and have cat ears :3 (perfect for all creatures)

If you see clips at the assembly that are only printed with a 38C3 logo you can feel free to take one of them. (A small donation to cover the filament costs is of course appreciated but not mandatory).