I've recently started using the SaxHolder made by JazzLab
info here.
Unlike a conventional neck strap, the harness takes the weight off the neck and distributes throughout the shoulder area. I still like the Gel strap I mentioned in an earlier post as the "best neck strap evar." but even it was causing me some strain. When I played standing up, the weight of my sax puling down on the sides of my neck seemed to cause an air leak into one or the other ofmy ears that was greatly distracting. With the SaxHolder, I haven't noticed the leak, I suppose due to no pressure on my neck.The SaxHolder is very portable. As can be seen in the pictures on the website, it folds up easily and can be carried in my music bag. My only complaint so far, is that the cord adjustment slider isn't terribly smooth acting. The slider on the Gel strap moves so easily that a minor adjustment in length is very simple. I may see if there is a way to have the cord and adjustment slider from the gel strap retrofitted to the SaxHolder.
Update
I had Joe from Just Joe's Music send me a cord and clip that he uses on his gel strap and replaced the SaxHolder's cord. It's now just how I want it. very freely moving slider and it only took a slight drilling with a 5/32" bit to enlarge the holes for the new cord.