Google Glass 3.0 could be the Oculus Rift you can wear to work: Or how to use your Dishwasher to clean your gutters, nonsensical headline but Google looks to be taking a shot at the Enterprise with these

the Battery Pack must be in the backpack.

http://www.techradar.com/news/portable-devices/other-devices/google-glass-3-0-could-be-the-oculus-rift-you-can-wear-to-work-1246018

http://phandroid.com/2014/04/28/google-glass-dual-wielding-patent/