"I have to admit it -- I bought this wrapper recently on eBay. Some guests to the museum had inquired as to whether I had one of these, and I realized it really was a gaffe that I hadn't acquired one back in the 70s. Call it temporary insanity. Thank goodness for eBay, where you can find just about anything you lost or overlooked decades ago. This came at a very reasonable price, too -- about $5.00 including shipping."
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.