hmmmmm maybe this is the reason why Huawei plans to use glass casing for p7.
If P7 comes with some kind of scratch proof glass material, it would be a killer feature.
Anyway to answer your question, i use a slim casing to be on the safe side and not have the horror scenario of seeing a scratch on the phone. Because it is a slim casing i haven't sacrificed too much of its original slimness.
You could on the other hand buy some kind of pouch type cover so you can use it without the pouch whenever using.