This looks like a good way to keep GPS, map, or other gear accessible. I have used the Ribz front pack, and it is very practical and works well. I have also tried the Raid Light Trail front pack. This one I didn't like as much, but I also did not carry it very much. It is bigger, but rides lower. It does let more air move between your body and the pack though, so cooler. Both of these options are a good deal less expensive than Hill People Gear one, however the HPG one looks to be of higher quality than the Raidlight.

Thanks for the info Phaedrus.