HARIO Ka-Ku Cold-Brew Coffee Bottle
The HARIO Ka-Ku Coffee Bottle (1 000 mL) is a square-shaped cold-brew jug with a fine mesh filter and sealable stopper, made from durable resin. Its slim, flat design makes it easy to store on its side in the fridge — perfect for batch brewing and clean pouring.
Large 1 L Cold-Brew Capacity
Brew up to eight cups in one batch — perfect for shared coffee or batch prep
Space-Saving Square Design
Slim, square-shaped body fits easily lying down in the fridge or against other bottles
Built-in Fine Mesh Filter
The integrated polyester mesh strainer ensures fine-level filtration for clean cold brew without grit
Secure Seal & Storage
Silicone stopper and tight-fitting lid keep your cold brew fresh and prevent leaks during steeping or transport
Discover a smarter way to make cold brew with the HARIO Ka-Ku Cold-Brew Coffee Bottle – 1 000 mL. This ingenious brewer simplifies infusion: just load your grounds in the internal strainer, pour cold water, seal the lid, gently shake, and let it steep in the fridge for around 8 hours. The result is a smooth, rich cold coffee concentrate (or ready-to-drink brew) that you can pour directly — no extra filtering equipment needed.
The square-shaped body is a standout design feature. Thanks to its flat sides, the Ka-Ku bottle fits neatly into your fridge door or on any shelf without rolling or tipping — a practical detail that makes storing your cold brew effortless. Despite its generous 1-litre capacity, the bottle weighs only about 400 g, making it light to transport and easy to handle.
Its construction uses durable PCT resin for the main body, which is both robust and BPA-free, and a polypropylene frame for the removable filter lid. The fine polyester mesh strainer ensures that you steep cleanly and then pour without disturbing settled coffee grounds, thanks to the built-in filter frame. A silicone rubber stopper helps to preserve freshness and maintain a secure seal while steeping or storing.
Cleaning is simple because the top section with mesh and lid is removable. You can rinse all parts thoroughly, and the materials used are selected for their resistance to odours and staining. This makes it ideal for regular use — whether you brew one batch a week or prepare multiple batches for a café, office or home setup.
For coffee professionals or enthusiasts, the Ka-Ku bottle is more than just a brewer — it’s a tool that promotes consistency, convenience and flavour clarity. Use it to test recipe ratios, to scale cold brew production, or simply to enjoy a large batch of your favourite beans cold-extracted overnight. It’s a space-efficient, low-fuss brewer that fits naturally into your workflow and your fridge.
Specifications
- Colour / Finish: Pale Grey (or similar)
- Capacity: 1 000 mL (finished brew volume)
- Dimensions: 90 mm (width) × 90 mm (depth) × 320 mm (height)
- Weight (with packaging): ≈ 400 g
- Body Material: PCT resin
- Top / Strainer Frame: Polypropylene
- Filter Mesh: Polyester
- Stopper / Packing: Silicone rubber
- Filter: Removable mesh inside bottle
- Origin: Manufactured in Japan
Use Cases & Benefits
- Home Cold Brew Brewing: Make your weekly batch of cold brew concentrate or ready-to-drink coffee in a single go, then store it neatly in your fridge door.
- Café or Office Batch Production: Brew large quantities of smooth, low-acid cold brew overnight, then easily serve from the same bottle without transferring to another container.
- Recipe Testing & Quality Control: Use the bottle’s internal mesh filter to evaluate extraction ratios and clarity during recipe development or tasting sessions.
- Portable Cold Brew for Events: Lightweight and durable, the Ka-Ku bottle can be used to transport cold brew to pop-ups, meetings or catering setups.
- Sustainable Brewing: As a reusable immersion brewer, it eliminates the need for single-use filters or paper — helping reduce waste and streamline your brewing process.