Fill a Purist water bottle about halfway up with ice, top it up with water, screw on the top, then find some fun stuff to do for the next 24 hours or so. (Make sure you get some rest, too.) When that time has passed, open up the bottle and take a sip. What will you be met with? Ice cold water that tastes exactly the same as it did when it went into the bottle.

Now listen, I know there are plenty of double-walled, vacuum-insulated water bottles that can keep liquids cold for an entire day as well as warm for a good 12 hours, which these can also do. That alone doesn’t make a Purist water bottle stand out, but it’s still impressive.

The reason that water or whatever other beverage you poured in there remains tasting, well, pure? That is a standout feature. Purist bottles have a surgical grade stainless steel interior that has a glass finish. The surface is impervious to incursion by liquids so it holds no residual flavors or odors and likewise imparts nothing to the fluids stored within. You could use a Purist for coffee in the morning, water in the afternoon, a cocktail in the evening, and then water at night, and provided you gave it a rinse between each use, you’d never know everything that passed through the bottle before. (And by “you could” I mean “we have,” by the way.)

Purist makes several sizes of water bottle: a perfect everyday 18-ounce bottle that fits car cupholders and is a good size for a daypack, a large 32-ounce bottle, and a smaller mug-like 10-ounce cup/bottle.

We bring one of our two 18-ounce bottles along any time we will be leaving the house for more than an hour. Seriously, we do. Because yes, I’m kind of retentive when it comes to hydration. If we’re headed out all day or overnight, then that bottle plus both of our 32-ouncers are filled and packed. And if my coffee is coming along, it’s in the 10-ounce Purist. In case you’re more into names than volume, the 18-ounce bottle is the Mover, the 32 is the Founder, and the 10-ounce Purist is the Maker, by the way.

Now here are two more things that truly make these the best water bottles for camping, travel, and everyday use: they all use the same caps. Yes friends, that’s right, the compact Maker, large Founder, and perfect middleman 18-ounce Mover all seal with identically sized lids. And those lids come in several types: a regular cap (with a handy flip-up arm for carrying or D-ring attachment), a screw-open sip top lid, and a sportier pop open spout. Regardless of which type of Purist lid you choose, it will fit on any Purist bottle, and that’s brilliant.

Then the other thing: the looks. In the grand scheme of things, the way your water bottle looks is a hellofalot less important than how well it works, but I’m not complaining that these water bottles look great. They have an elegantly simple design with clean lines, subtle but assured colors, and a matte finish that adds a touch more style and makes them easier to hold.

And even with near daily use over the past couple of years, our Mover water bottle still looks great and works flawlessly, as do all the others that have to settle for mere weekly use.