The protective sleeve is well finished and offers adequate protection for the transport of notebooks in normal backpacks. The zipper is separated by a material lip from the notebook, so here ensteht no friction. I use the shell with a Lenovo T410 with the normal 6-cell battery (fits perfectly). But in my estimation, should the 9-cell battery, see Course (the material is sufficiently flexible). The only complaint is the thickness of the material used, which does not mean that it would be too thin. At higher price points there are simply thicker material. But for around 16EUR can not complain. Therefore -> full marks