Some of the designs are these: The laptop bag has a big separate, and cushioned compartment that will fit a 17-inch screen size laptop, and it also has other compartments that can take papers, and other laptop accessories.
Built in front of this laptop bag is a pocket that is meant for an MP3 player, which has openings for earphone, with also a compartment for PDA/pocket phone, and also for business cards. You probably have everything you need in this laptop bag.
Interestingly, this laptop bag, and majority of quality laptop bags are made with a water repelling material, which ensures that your laptop notebook is protected from rain, or other water-harsh conditions. It also a waist strap, moulded handle, additional back cushions and a sturdy nickel fittings whichs gives your laptop notebok an additional protection whenever you are carrying it.
This laptop bag is just very comfortable for your easy carriage. Another example of such laptop bags is the Samsonite Quad Backpack which is also a laptop bag that gives comfort and durability, and also provides a stylish look for a modern laptop user.
This laptop bag also has many features like the other one, so in short they come in designs that are useful for other mobile gadgets, such as iPod, MP3, phones, etc.