The roll should have a protection flap on top. Like the one on Wanchers pen roll.
Without the flap, the pens can slide out of the roll.
http://www.engeika.com/product/508
Srednasoftthere are people who do not like flaps and do not need them. I, for example, carry my pens nibs up, and would very much like to see how they can slide out.