"I purchase this Sling as a method to carry my X120 outside my back pack. I realize to some this maybe odd, but in some cases, I only need my X120 and don't need all my other stuff. I am an IT Professional currently working on MS Certifications and mainly use the X120 for running VMs, so this sling fits the bill as sometimes I only need my X120 and nothing else. The only "con" I have is the external pockets, very limited space. I carry the X120 with one extra battery, charger and wireless and that is all I need, so more space would allow me to carry more, but I honestly don't need to carry more that that."