The thing to remember is that when it comes to portable laptop protection, there's two main categories. First you have the sleeves. These are built to protect your laptop against scratches and other small cosmetic damaging. These do not protect against impact or other forces that could dent or seriously damage your laptop; do NOT use a sleeve alone in a backpack full of hardback books that you sling around all day, you will eventually damage your laptop. The other type is cases. These are obviously bulkier than sleeves, but provide much improved protection. In addition to protecting against cosmetic damage, they will also protect against those stronger impact forces that will seriously harm your laptop (to a degree). Be careful when you decide which to choose.