The reason why you buy a laptop instead of a PC is because you want a computer you can take with you wherever you go. You don't want to just stick it under your arm and take it onto a crowded street, though. Exposing it to the elements and taking a risk that it will be knocked out of your hands is not a good idea. Then you need to consider the accessories you need to carry with you. When you purchase a laptop, also purchase a laptop carrying case that has been designed for the size of your computer and the number of accessories you normally carry with you.
One thing you will always want to take with you is your battery charger. Laptops today have long lasting batteries, but they won't last through a long working day. Even if you're just going out for coffee at a Wi-Fi cafe, you will be using battery life and when you return home or to work, you'll want to recharge your battery. All laptop carrying cases come with compartments for your battery charger.
It's always nice to have a mouse handy, even if you use your laptop's touchpad most of the time. Even a compact laptop carrying case will have a separate compartment for a mouse and even a mousepad. Does this mean that you can make do with just any old case?
In fact, if your case is going to be carrying any accessories at all, you really should take a good look at how well it is going to secure those laptop accessories. If you have ever owned a cheap nylon case, you'll know that you will often find that your computer, mouse and power cord end up jostling around in the case. This can't be good for your laptop or your accessories in the long run.
What if you want to take a USB cable, a flash drive, a selection of compact discs and other accessories with you? Do you just stuff them in wherever you can? If that's good enough for you, then you don't need a laptop carrying case at all. Just throw everything into a bag and it will protect them as well as a cheap nylon case would. They won't be protected from damage, though, either from the outside or from the inside.
If you're going to spend money on a case for your laptop, you may as well buy a quality case. The very best of these are aluminum laptop carrying cases. Their outer shell protects your laptop from falls and the environment, while the neatly arranged compartments inside the case protects your computer and all your accessories.
Take a look inside an aluminum laptop briefcase and you'll see that it has a place for everything and that everything stays in its place. This is what you want to see in a briefcase. Your laptop is a significant investment. Don't sell it short by giving it anything less than a high quality aluminum laptop carrying case.