Plastic bottles, especially the single-use ones, are everywhere. Easy to grab, cheap to produce, and even easier to throw away. Over time, they pile up, not just in bins, but in rivers, oceans, and forests. Wildlife gets tangled in them. Soil gets clogged with them. They are burnt, dumped, and left to drift, sometimes for hundreds of years. And yet, one decision can change that entire pattern: the decision to carry something reusable instead.