Hi everyone! The zipper on my PSM backpack is just awful! It doesn't zip smoothly and takes forever to get in and out of the bag. I have already tried using candle wax to smooth it out and it helped a bit but not by too much. Also tried using graphite as well. Does anyone have any other suggestions on how to fix this? I have already searched the forums and everyone seems to recommend graphite and wax/wax paper. I'm pretty bummed by the quality of this bag since it was so expensive and took awhile for me to get ahold of :| but thanks in advance for your help!