The interior is roomy, and there's a separate interior compartment for holding your laptop or tablet. While the bag is lightweight, the only downside is that it doesn't provide a whole lot of protection for your laptop.
One of the two leather straps you use to keep the bag closed. If you have a lot of stuff in the bag, you can shift to the lower hole. It's not the most secure system but the bag generally stayed shut when I attached the straps.
You can access a separate, large interior compartment from either side of the bag. It's just one big compartment with a small ultrasuede pocket (for storing your phone) stitched onto to it on the inside.
I would have preferred if the large compartment was split into two smaller compartments, one you could access from the left pocket, the other from the right.
The Vitesse is a great-looking messenger bag that's comfortable to carry around and is water resistant. My only small gripe is that I would have liked to have a few easy-to-access compartments on the outside of the bag -- under the main flap -- instead one huge one.
Otherwise it's a great messenger bag and reasonably priced for a swanky messenger that should hold up well over time.