Has anyone figured out an 'easy' way to add a zipper on top in place of the button. I am a little perplexed because of the 'tuck' on each end, which of course I want to keep, so zipper would have to be added in between.....any one have any brillent ideas on this one..... I so much prefer a zipper in todays world you can not take too much caution to protect your stuff.......How about velcro, has any one tried that.....