When you have reached your destination you can just take the bag or the whole unit with you.
The bag easily houses an DIN A4 sized paper, notebooks of similar size, and lots of other things. The bag can be worn very comfortable with the loop, and the two, big front pockets offer room to store more things.
Very comfortable and safe while riding the Vespa, because you do not have to wear an impractical rucksack any more.
The seems are well finished, and the decent, black look with the classic, white lining suits perfectly any bikes paint.
Great design with practicability in good craftsmanship!