In my mind, there are three types of products you can buy in any category. Firstly, there are the strict necessities — think cotton T-shirts or toothpaste. Then there are the “nice-to-haves”: Your reusable water bottle, your favorite cologne, etc. You could live without them, but they make life a little more enjoyable. And then there are the life-changers. They're unexpectedly clever, fulfill a specific purpose, and complete your life even though you never knew you needed them before.
