Pen portfolios, e.g. those by Gutberlet (gutberlet.com) or collection portfolios from penboard.de, have proven good for keeping pens well protected. For a showcase look Montblanc offers a piano-lacquer black collector box that costs around 550 euros depending on size and holds up to 20 pens; variants in blue, green and a dark-brown wooden case matching the Mozart collection with an embossed star are also known. In daily use pieces are often kept in cases or pen stands. Leather loops in simple folders often do not hold ideally and are described as a sub-optimal solution. For exact prices ask at the boutique, as these collector boxes are not always listed.