How to Use the MiiR Cold Brew Filter With Your Wide Mouth Bottle
By Backpacks, Bags, and Apparel for Anywhere | Published: 2026-11-02
Category: How-to Guides
Turn your MiiR 32oz wide mouth bottle into a cold brew maker with the reusable stainless steel filter. Follow these steps for smooth, sediment-free coffee at home or on the go.
Quick answer
To use the MiiR Cold Brew Filter, add coarse-ground coffee and cold water to your MiiR 32oz wide mouth bottle, insert the stainless steel filter, and steep for 12–18 hours. Then remove the filter and enjoy smooth, sediment-free cold brew at home or on the go.
Why the MiiR filter works with your wide mouth bottle
The MiiR Cold Brew Filter is designed specifically for the MiiR 32oz wide mouth bottle, turning it into a no-fuss cold brew maker. The stainless steel mesh delivers a smooth, sediment-free brew, so you can skip paper filters and disposable pods. This setup is ideal for daily rituals and weekend camping alike, because it’s reusable and packs easily with your bottle.
Choosing the right coffee and grind
Use coarse-ground coffee, similar to sea salt, to prevent fine particles from clogging the mesh and turning your brew cloudy. A medium-coarse grind works if you prefer a slightly stronger cup, but avoid espresso-fine grinds. Freshly ground beans give the best flavor, but pre-ground coarse coffee is fine for convenience.
Cold brew ratio guide for your bottle
For a balanced concentrate, use a 1:4 coffee-to-water ratio by weight (for example, 100g coffee to 400g water). If you prefer a ready-to-drink brew, use 1:8. Since the MiiR 32oz bottle holds about 946ml, you can scale accordingly. Start with 1:8 for a smooth, easy-drinking cup, then adjust to taste.
Cleaning and care for long-term use
Rinse the stainless steel filter under warm water immediately after each use to prevent coffee oils from drying and clogging the mesh. For a deeper clean, soak it in a mixture of baking soda and water for 15 minutes, then rinse thoroughly. Avoid abrasive brushes that can damage the mesh. The filter is not dishwasher safe according to the manufacturer, so hand washing is recommended.
Step-by-step: How to make cold brew with your MiiR wide mouth bottle
- Measure and grind your coffee: Weigh 100g of coarse-ground coffee for a 1:4 concentrate, or 60g for a 1:8 ready-to-drink brew. Use a burr grinder for consistency. Common mistake: using fine grind, which clogs the mesh and slows filtration. Check that your grind looks like coarse sea salt before adding it to the bottle.
- Add coffee and water to the bottle: Place the coffee grounds directly into your MiiR 32oz wide mouth bottle, then pour cold filtered water over them. Leave about an inch of headspace. Common mistake: overfilling, which can cause overflow when you insert the filter. Use a scale to measure water for consistent ratios.
- Insert the filter and stir gently: Lower the stainless steel filter into the bottle, pressing it down until it sits snugly. Stir gently with a long spoon to ensure all grounds are saturated. Common mistake: not stirring, which leaves dry pockets and weak flavor. Make sure the filter is fully seated before brewing.
- Steep in the refrigerator: Secure the bottle lid and refrigerate for 12–18 hours. For a stronger brew, go up to 24 hours. Common mistake: steeping at room temperature, which can introduce bacteria and off-flavors. Set a timer so you don’t over-steep and get bitter coffee.
- Remove the filter and serve: Lift out the filter, letting excess coffee drip back into the bottle. Discard the grounds (compost them if possible). Your cold brew is ready to drink; dilute with water or milk to taste. Common mistake: pressing the grounds, which releases bitterness. Store leftover cold brew in the refrigerator and drink within 3 days.
- Clean the filter immediately: Rinse the filter under warm running water, then soak in a baking soda solution for 15 minutes if needed. Use a soft brush to dislodge grounds. Common mistake: letting grounds dry in the mesh, which makes cleaning harder. Air-dry the filter completely before reassembling.
Product facts
- Topo Designs x MiiR Cold Brew Filter: Designed for the MiiR 32oz wide mouth bottle, this reusable filter turns your bottle into a cold brew maker. You can make cold brew without extra equipment, using the bottle you already carry.
Topo Designs x MiiR Cold Brew Filter - Topo Designs x MiiR Cold Brew Filter: The stainless steel mesh delivers a smooth, sediment-free brew every time. You get clean-tasting cold brew without grit, even without paper filters.
