If you have been to a college campus in Southern California, you're most definitely familiar with the concept of Hydro Flasks. Usually plastered with stickers and full of dents, they're kind of hard to miss when walking from class to class. You can always pick out the Hydro Flask owners in a classroom because they're the ones that audibly cringe when someone drops one on a hard surface.

For those of you that have no idea what I'm talking about, let me clue you in. Hydro Flasks are, as you may have deduced from the name, water bottles. The original Hydro Flask can be bought in 7 sizes, ranging from 12 to 64 ounces, in a variety of colors. The Hydro Flask website boasts that their bottles can keep beverages hot or cold "hour after hour."

Seems like just your normal, run of the mill, insulated water bottle, right? Wrong.

Hydro Flasks are everywhere. They're pretty much the go-to accessory for college students. From where I'm sitting in my school library right now, I can see at least seven within 30 feet of me. If I were to venture out onto campus at this very moment, I'm sure I could easily spot 50 in a matter of minutes.

At one point, my university's bookstore had an impressive display of Hydro Flasks in our school colors. On-campus organizations have done giveaways of these bottles and throngs of students lined up for the chance to get one.

At this point, you may be wondering why these seemingly average water bottles are so popular. What sets them apart from literally any other metal water bottle I could go out and buy right now?

Before I answer that, I must make a confession: I am a proud Hydro Flask owner. I received a purple, 32-ounce Hydro Flask for Christmas 2016 and it has not left my side since. I'd say it's probably right below my phone, keys, and wallet on my list of things I don't leave home without.

But why? Why are people so crazy obsessed with these bottles? I've had numerous people ask me if it was worth it to drop $40 on something they could buy at Costco for half the price. I've always said yes.

First and foremost, Hydro Flasks are great because they really do follow through on their claim that the bottles keep things at the desired temperature for a really long time. As long as I fill the bottle with enough ice, I've known it to keep my water cold for over 24 hours.

But really, I think the prevalence and borderline obsession with Hydro Flasks stem from their trendiness. People buy them because all their friends have one, and then realize that it's a useful, quality product. Don't ask me how the trend started, all I know is that it's spreading like wildfire.

If you're on the fence about hopping on the Hydro Flask bandwagon, here's what I'll tell you. Since owning mine, I've actually been more inclined to drink water and I've felt healthier because of it. It's making healthy water consumption trendy! Decorating it and making it your own makes it something fun and cute that you're not self-conscious about carrying around all day.

So, all-in-all, I think the Hydro Flask deserves the hype that it's gotten. It does its job and is a cute accessory to boot. So, rock on Hydro owners.