I never tried it in a harness before. As i personally dont like the idea of harnesses so ive never used them. I just had some packing boxers i put it in and it worked fine. Also, as far as packing is concerned, dont try to pack it with the shaft down, that never works with large packers, thats how you end up with that monster buldge is when you try to pack it downward. If you postition the shaft upward, it really isnt really noticable at all.