They have 13 MacBook Pro cases that are custom designed for your computer. While there are a plethora of case companies out there, there is only one that can claim to have created the Apple specific case market. So keeping it clean and scratch and dent free is in your financial best interest! It makes upgrading in 2-3 years much easier if you can get top dollar for your used machine. This should be an incentive to keep the laptop in good to excellent condition. One really good thing about Apple portables is they have the highest resale value in the tech world.
Not sure what your budget is, but if you have a 13' MacBook Pro you're going to need a good quality case to transport and protect it. I would agree on the time machine backup drive.