This can changed my life for cleaning glass. I couldn't stop cleaning glass for days when I first discovered it.
I won't buy retractable pens, if I do I just end up with ink on my pants when I forget and put them in my pocket. I like these:
Real full-grain leather belts. Might cost you $100+, but they never, ever die. I got mine here. Here's an article about types of leather so you'll know not to buy sh*tty leather anymore.