Why I love it
You might be wondering: Why would anyone prefer to use a super-small water bottle? More often than not, I just don’t need a giant water jug with me. I usually only need a few sips to get me through a walk or a trip to the store, and sometimes I just don’t have the space for a big bottle. If I’m heading to the farmer’s market with a canvas tote or to the park with only my crossbody bag, I can easily fit my Micro Hydro inside—and I’m totally hands-free. Even better, the mini bottle features a removable clip strap that lets me attach it to the side of my bag in a pinch.
I have the 300 mL bottle, which is the medium of the three available sizes, and I’ve been bringing it with me to every one of my Pilates classes this month. I typically only have time to take a few sips during my workout class anyway—and now I don’t have to lug a huge bottle with me on my walk back home. It’s also been the water bottle I’ve been reaching for when I’m running errands, meeting a friend for coffee, or driving around town (I don’t like to drink too much water when I’m in the car).
But the thing I’m most excited about is how well this bottle travels. I hate how much precious space an empty reusable water bottle takes up in my personal item on a flight—but I always want to have one with me when I arrive at my destination. My small-but-mighty bottle offers the best of both worlds: It barely takes up any space in my bag, but I’ve still got a clean vessel to use throughout my trip. And then when it’s time to sightsee in a new city, I’ve got something lightweight and easy to carry to keep me hydrated. It might sound wild, but really, if I run out of water—at a workout class, the gym, or the airport—I can always refill it when I need to.
Plus, it’s made with the same stainless-steel, durable-wall insulation all of Hydro Flask’s tumblers are—so you can count on it to keep your hot drinks hot for up to 9 hours and cold drinks ice cold for up to 24 hours.
More sizes available
Because every ounce counts when we’re talking about miniature water bottles, I wanted to see how much smaller or bigger the other two new sizes really were. So, I elicited the help of two editors on my team. Commerce writer Jessica Sulima tested the smallest size, the 200 mL bottle, and commerce director Madison Flager gave the largest size, the 400 mL bottle, a try. Here’s what they had to say:
The cons
The Micro Hydro doesn’t come without a few cons, though. My biggest one is that the mouth of the water bottle is too small to fit ice cubes in. I’m sure if you had those coveted tiny ice pebbles they would fit, but your classic cubes won’t. Because of the small opening, it’s also tricky to clean by hand or with a sponge. It is dishwasher safe, though, so that’s definitely your best bet. My other gripe is that I love a straw and do wish my tiny bottle was sippable. But none of those are deal breakers in my book.

