I actually really like it. That might be in part due to my expectations of them making the pack too sleek, like it had been designed in a computer and custom machined. But I'm really glad they stuck to the "junk drawer build" look that made 80's sci-fi props so awesome. My one major nitpick would be that they should've put the rectangular drawer on the top and the circular part on the bottom, to further invoke the overall gestalt of the original.
Everything else about the movie looks to be a hot mess, but at the very least we got a pretty cool alternative proton pack prop to build! Now I'm interested in seeing what the trap and PKE meter look like.