Originally Posted by BARACU
I have the same problem with a bag on my Heritage. I haven't gotten around to fixing it yet, since I only use the rack, backrest and passenger seat for extended trips when I need a large bag. I planned on securing a 1/4" or 3/8" piece of plexiglass to the inside bottom of the bag to stffen the bag. No harm done to the rack this way.
That sounds like a good idea too. Plus you would not need to worry about the external rear straps. I am wondering if it would cause the entire bag just to tilt down at an angle though? I strap mine on the front side but still get the tilt down due to weight.
Do your side pouches sag too? I carry a couple of water bottles so they sag some.
My problem is only with extended trips too.