I mean, the man who tells the wizards what to wear is the man who finds out!Yeah, it could just be a regular old ponder orb, but like I said, it looks to be about the same size? At the very least, it's evidence that Warhammer wizards can and do just walk around with large, glass spheres in one hand, so doing the same with an Orb might be possible.
If our breaker of the laws of the universe wants to lug around a 3 kilo ball of glas, who are we to say he can't?