A good bag is one you forget after the first hour. It should keep your back comfortable, hold one laptop, a jacket, and cables without becoming an organisational project.
Inside the bag, a simple cable case removes the messy part of travel. If it can hold chargers, adapters, and cards without bulging, packing becomes almost automatic.
The bag should also feel good when you walk for a day. A narrow shoulder strap, a secure laptop bay, and water-resistant fabric are more valuable than tiny extra pockets.
For many people, the winning combination is one versatile backpack and one compact cable case. Add nothing else until a trip demands it.