I got the Wolfskin Subway at Christmas because I liked this little practical shoulder bags and oriented me with the request variant to the volume information. Among Umhängern the Subway with 13 liters of the largest. Well, as Wolfskin comes to 13 liters, I can not really explain, because I hardly get anything in addition to a 1.5 liter bottle in the bag to me. Because of the drop shape, it is not possible to cram a thicker block A4 in the bag without it to bend.
Both design and workmanship are good, the seams see from stable, so I could imagine that the bag participates everyday hardships long. My search for a Eingurtrucksack with more practical (trapezoidal) shape and size continues.