Fountain pens and ballpoints are unproblematic in carry-on luggage and are usually not objected to at security. Even large quantities (up to about 100 writing instruments) were carried along on Penshow trips to Rome; only opening of the cases was needed. The ink filling level was not paid attention to. Even ink bottles were inspected more closely but allowed through, provided they stayed under the general liquid limits. Precautionary, transport of the pen empty or emptying before take-off is recommended to avoid pressure differences and leak risks.