I've been struggling for a while to remember to keep a microfibre cloth handy to keep my glasses and phone screen clean, and usually if I want to keep something that I can remember handy I attach it to my keychain, like I have with my flashlight or my pillbox, but alas, there were no keychain compatible glasses rag. I was lamenting this with someone and it clicked with me that I could just punch an eyelet into one of my existing microfibre cloths, pair it with a spare carabiner, and now I have a glasses rag I'll never leave behind.
