Looking at the photos I can see how you’d think so. But, no, fragility is very much NOT an issue. The back end of the arc mouse snaps solidly into place when it is folded open or closed.

We actually lost the carry case to our arc mouse ages ago. When we travel with this mouse we fold it up and throw it into our bag with our other assorted belongings. Our arc mouse has stood up to months of this abuse and is still in fine working order.

Thanks for your question.

Thanks