Is there a guitar case style that is the same as a tennis racquet bag?

I am trying to find a guitar case for my acoustic Takamine. My friend told me about the one that looks like a backpack, but I don't really like it being double strap. So I was wondering if there was one that has one strap that goes across the chest. Kind of like a tennis racquet case. If there is such a style, what is it called?