That's why we encourage you to take a lunch to work or school. Because of how much 'less' it creates.
On the one hand, buying a rü means 'one more' belonging. But if you use it frequently, it saves thousands of single-use disposables from being wasted each year; countless bad calories from being eaten; and thousands of your hard earned dollars from being spent.
A lunch bag isn't going to change the world. But small things done by lots of people will.
But before you run off to buy a rü (or before you make any other purchase for that matter), please consider the following questions.
Either you can't live without it, or life would be considerably worse without it.
Ideally the things we buy will last greater than 10 years or cost less than $1 per use.
How do you know if something is affordable though? Try this test out. If you can mentally double the price and still feel good about your decision to buy, then you know it's an affordable purchase.
Taking into consideration the energy required to make the product and get it to you; the waste it offsets when you use it; the waste it creates when you're through with it; and any other positive or negative externalities.
Are your dollars going towards an honest small business bolstering the economy? Or are they funding fast fashion, discrimination, and environmental degradation? Choose sustainable, ethical, and socially responsible.