Portable back support

I read a Cool Tools review of the Nada Chair S’portbacker from several years ago, and since my back has been sore from sitting at my desk so much lately, I bought one a couple of weeks ago. Basically, it’s an adjustable strap that goes around your knees and lower back, which allows you to lean back without slouching. As the maker says, you wear the chair. My back soreness is gone, and I don’t get as drowsy while working when I wear it. It also allows me to sit cross-legged on the ground comfortably for the first time in my life. — MF