User blog comment:Le Rottweiler/statkey/@comment-1496755-20150718104317

My guess is that it's either a Doom-style backpack (which was supposed to use the Backpack (Q1) model) or a jetpack (to show off the capabilities of the new 3D engine, perhaps).

The cube-like object is a mystery - perhaps an occult artifact. And the one next to it looks like boots - for faster walking/running?