This Red Designer iPearl 13 inch laptop sleeve will just hold a 13.3 inch laptop snugly. The more snugly the sleeve fits the laptop, the better the laptop is protected. Make sure you buy one that's fitted to your laptop. Since these are usually made a bit big for the size they're advertised for, a 13.3 inch laptop fits into a 13 inch sleeve perfectly. You do NOT have to buy a 14 inch sleeve.
Made of stretchable material this sleeve was designed to fit snugly around laptops starting at 12 inch and all the way up to 13.3 inch. Remember that whatever you buy, you will still have to treat your laptop with care. No cover is going to be able to protect your laptop against sharp objects or heavy duty throwing and bumping. The case helps, it doesn't guarantee that your laptop will survive your busy life totally without bumps, fingerprints and scratches. Nothing can guarantee safety. Your own careful conduct will have to compensate for the vulnerability of the notebook.