There’s something incredibly satisfying about finding a product that just works—no fuss, no frills, just smart design and a purpose behind it. That’s how I felt when I came across the MiiR 23oz Narrow Mouth bottle.
As someone who’s always outdoors—birdwatching, hiking, or just soaking in some fresh air—having a reliable water bottle is non-negotiable.
This one checks all the boxes: it keeps drinks cold (or hot), doesn’t leak, fits in my bag, and looks good doing it. But what really sets it apart? MiiR’s commitment to doing good for the planet and people. That kind of mission matters—and it’s something I’m proud to support and share here on gotobirding.com.
Right now, the bottle’s down to $23.70 (£18.95) from $49.95 (£39.95), and with the code EXTRA15, you can take an extra 15% off. So if you’ve been thinking about upgrading your water bottle game, this one’s worth a closer look.
Designed for Daily Use and Outdoor Living
The MiiR 23oz Narrow Mouth is made for real life—whether that’s your morning commute, a forest trail, or just working from your garden bench. At 680 ml, it’s the ideal in-between size—not too bulky, not too small. It fits easily in car cup holders and side backpack pockets, so I’ve never had to leave it behind when space is tight.
The narrow mouth makes sipping feel natural and spill-free, even when you’re moving. But what impressed me most is the double-wall vacuum insulation—my tea stays piping hot for hours on chilly walks, and my water stays cold on sunny birding days. No condensation, no warm sips halfway through the day.
Built to Last with Quality Materials
This bottle isn’t just about good looks. The 18/8 stainless steel body is built tough and doesn’t pick up smells or flavors—so switching from coffee to citrus water is no problem. There’s zero metallic aftertaste, and that’s something I really value.
The leakproof lid gives me peace of mind when I toss it into my rucksack. I also love the angled grab handle—a small feature that makes a big difference when you’re reaching for it with one hand or clipping it onto your pack.
The Hardshell™ Powder Coat finish has held up beautifully, even after months of rough use. No chips, no scratches—just a clean, vibrant look.
Specs At A Glance
- Capacity: 680 ml
- Size: 28.5 x 6.9 cm
- Weight: 331 g
- Material: BPA-free 18/8 stainless steel
- Color: Prismatic (seriously eye-catching)
A Bottle That Gives Back
MiiR isn’t just selling bottles. They’re building a movement around thoughtful consumption and global impact. Every purchase helps fund projects that improve access to clean drinking water, support local communities, and protect natural ecosystems.
They’re a certified B Corp, which means they’re held to the highest social and environmental standards. They’re also Climate Neutral Certified and a member of 1% for the Planet, donating part of every sale to environmental causes.
What I find especially meaningful is their commitment to Net Zero by 2030, and their ongoing work to reduce emissions, improve circularity, and extend product lifespans. It’s rare to see a company so transparent and mission-driven in this space.
Final Thoughts – More Than Just a Water Bottle
It’s easy to overlook a water bottle as “just a water bottle,” but this one really made me pause. The MiiR 23oz Narrow Mouth is a tool I use every single day, and it’s become part of my outdoor kit. It’s practical, dependable, and ethically made. And it’s the kind of product that quietly makes a difference—both for the user and the world around us.
At £18.95 (plus another 15% off with code EXTRA15), it’s a steal for something this well-made. Whether you’re birding at dawn or packing your bag for work, this is a small switch that makes staying hydrated—and living sustainably—that much easier.
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