MiiR
Quick verdict: Want a steel bottle where the company itself has been audited, not just the bottle? That’s MiiR. It’s been a certified B Corp since 2014, it holds the Climate Label for 2026, and it gives through 1% for the Planet, and we confirmed all three at the issuers rather than on MiiR’s own badges. The bottles cost about what a Hydro Flask does. The catch is a question MiiR hasn’t answered publicly: whether there’s lead in the vacuum seal. Our rating: 4.0 out of 5.
Who they are
Bryan Papé started MiiR in Seattle in 2010, after a ski accident got him rethinking what a business was for, as he told Seattleite. The name nods to John Muir. It began with bottles and now covers tumblers, travel mugs, wine and bar cups, bags and a fair amount of coffee gear, about 170 listings on the store.
It’s still Papé’s company. MiiR’s about page calls it “independently owned and operated,” and it holds Certified Evergreen status, which is aimed at private companies that intend to stay that way. Startup databases list one outside investor. We couldn’t confirm that stake or its size, so we scored ownership a notch below fully founder-owned rather than assume it’s nothing.
What they get right
The certifications check out where it counts. B Lab lists MiiR, Inc. as a certified B Corp since March 2014 with a score of 95.5 (80 is the pass mark). The Climate Label register shows it certified for 2026, with 5,999 tonnes of CO2e measured for 2025 and $222,170 spent on climate projects to cover it. And 1% for the Planet lists it as a whole-company member. Every one of those badges matched its register, which is rarer than it should be. Three brands the internet still calls B Corps turned out not to be when we looked this year.
They publish the numbers. There’s an impact report every year from 2019 through 2025, linked from the about page. MiiR also publishes what its products are made of: 18/8 stainless steel inside, a powder-coat outside, polypropylene and Tritan lids, plus a restricted substances list. It says third-party tests on its products came back with lead “not detected” at a limit under 0.002 ppm.
Every product funds something. Each item carries a Give Code that tells you which nonprofit project your purchase went toward. It’s a little gimmicky. It’s also traceable, which most “we give back” programs aren’t.
Where they fall short
The vacuum seal question is still open. Here’s the thing. Most insulated bottles are sealed at the base with a small dot, and on some brands that dot contains lead under a cover. Klean Kanteen and Purist both say plainly that their seals are lead-free. MiiR’s materials page talks about tests on the product and never mentions the seal, which doesn’t mean there’s lead in it, only that the answer is missing in the one place people are now asking. Our water bottle roundup flags the same gap.
No named factories. For all the reporting, MiiR doesn’t list where its bottles are made or who makes them. Brands at this certification level often do.
The paint chips. OutdoorGearLab scored the Slate bottle 81 out of 100 and their main complaint was a powder coat that scuffs and chips with rough use. It’s cosmetic, but you’ll notice it.
What they sell and what it costs
Prices come straight from MiiR’s own store, full price, no sale colorways:
- Wide Mouth Bottle: $32 for 16 oz, $35 for 20 oz, $40 for 32 oz
- Chug Bottle: $40 for 20 oz, $45 for 32 oz
- Straw Bottle, 20 oz: $40
So figure $35 to $45 for a bottle. That’s $$, right in line with the big insulated brands, and a steel bottle you keep for a decade is about as good as value gets in this category.
Who it’s actually for
Buy MiiR if what you care about is the company: audited ownership standards, a measured footprint, and giving you can trace. On those points it’s one of the strongest bottle brands we’ve looked at.
If lead is the reason you’re shopping, start with Klean Kanteen instead, since it puts a clear lead-free seal statement in writing. And if MiiR publishes that answer, we’ll update this page.
Deals and discounts
No affiliate relationship on our side. MiiR runs occasional sale colorways, so the same bottle in a discontinued color can show up for about half price.
Related reading
Frequently asked questions
Is MiiR a B Corp?
Yes. B Lab’s directory lists MiiR, Inc. as a certified B Corporation since March 2014, with a score of 95.5. We read it in the directory itself rather than taking it from MiiR’s site.
Are MiiR bottles lead-free?
MiiR says third-party tests on its products found lead “not detected.” It hasn’t said publicly whether the vacuum seal at the base of its insulated bottles contains lead, which is the part of the bottle the lead question is usually about.
Is MiiR independently owned?
Founder Bryan Papé, who started it in Seattle in 2010. MiiR describes itself as independently owned and operated, and there’s no parent company. Startup databases list one outside investor with an undisclosed stake.
Where is MiiR based?
Seattle, Washington. That’s where it was founded and where its flagship store is.
How much does a MiiR bottle cost?
Most bottles run $35 to $45 at full price. The 32 oz Wide Mouth is $40 and the 20 oz Chug is $40.