What you heard is wrong. Parker uses Mo Dou and disposable ink bags, and their interfaces are the same, so you can use disposable ink bags when you are on a business trip, and you can use traditional ink instead of Mo Dou at ordinary times. The taipan series promoted by Montblanc basically uses piston ink, using traditional ink instead of disposable ink bags. There is also a travel version that can use disposable ink bags, but can't use the traditional inking method.