Just thought I would throw this out to the group. My jet pack is pretty solid and it has some weight to it. I was a little concerned about how to build a harness and I did not think the average black nylon strap was going to cut it. I searched for 'military harness' on Ebay and came up with an ammo harness that came over the shoulder and had the grommet style belt. I used the belt to fit around my chest and then cut and sewed the remaining straps together. This is working great for me. It features a low profile front clasp that helps since it is under the armor and the harness is very sturdy. The sholder straps are also padded and are very comfortable. The nice thing is the military also kept in mind that all its attire for it's troops may need to be mended in the field and it is fairly easy to sew. Just thought I would drop this in case someone else was looking for a way to hold up a heavier style jet pack or just wanted an alternative idea. Enjoy.