On your way to class, you see a girl with a large bottle that belongs more on a rocket ship than a college kid’s possession. The brightly colored bottle—a Hydro Flask, you later learn—swings from her fingers. Stickers with hashtags like #savetheturtles decorate the bottle’s metal surface. You speed up, because you’re going to be late, and you notice that she wears a Pura Vida necklace, despite the weather being 50-something degrees, and the beach being more than 90 minutes away.