Using screen guard and back guard to protect iPhone 4s?

I want to use my iphone4s without back cover which makes it bulky. Using screen protector will be sleek to use and carry. However I feel that the camera at the back side will get scratches, if the back side is guarded by a thin layer of sheet only but Please help me and suggest if this is practical and I will not harm my iphone by getting rid of rub-plastic cover.

I'm now using back and front solid glass covers which has really made my iphone much lighter to use. If someone sees my phone upside down it appears to be iphone5s gold. The cover is fancy but I liked it, works great hopefully for now.

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