A hanging-ear filter bag is a paper pouch with folded supports that rest on a mug’s rim. Add ground coffee, pour hot water through it and discard the bag after brewing. You still need a suitable mug and a hot-water source, but there is no separate dripper to wash.
Two things decide whether the cup works: the mug and the pour. Pick a mug tall enough that the bottom of the bag never touches the finished coffee, use a medium grind, and keep every pour below the top edge of the paper. If the bed drains slowly, stop adding water instead of letting the bag overflow.
A practical first recipe: use 10 g of medium-ground coffee and 160 g of hot water. Wet all the grounds with about 25 g, wait 30 seconds, then add the remaining water in two or three small pours. Adjust the next cup by taste.
Hanging-ear coffee recipe chart
| Coffee | Water | Approximate ratio | Use when |
|---|---|---|---|
| 10 g | 160 g | 1:16 | A small mug or a first test |
| 11 g | 175 g | About 1:16 | A slightly fuller serving |
| 12 g | 190 g | About 1:16 | The bag and mug still have safe clearance |
Treat these as starting points rather than fixed product claims. The Specialty Coffee Association describes 60 g of coffee per liter of water—roughly 1:16.7—as one common way to write a drip-brewing ratio, and the chart above stays close to that while fitting a small single-cup format. If your bag or cup can't hold the listed dose comfortably, drop to the smaller recipe instead of packing the filter tight. Our pour-over ratio guide scales the same math up to larger brewers.
What you need before you start
- One empty hanging-ear filter bag
- 10–12 g of coffee, ground around medium
- 160–190 g of hot water
- A stable mug that supports both paper arms
- A scale, or a measured pouring method
The Yozcoffee hanging-ear coffee filter bags ship empty: white nonwoven filters in a 50-pack, each unopened bag approximately 90 × 75 mm. That figure describes the bag itself, not the diameter of your cup. Coffee, mug, kettle and grinder aren't included—you can put the rest of the kit together from our travel coffee collection.
A compact coffee scale reading to 0.1 g helps you repeat a small dose. If you grind before brewing, the 38-setting USB-C grinder has a roughly 25 g hopper, enough for the recipes here. Adjust the setting by flow and taste.
How to use a hanging-ear coffee filter bag
- Check the mug. Set the empty bag over the cup and unfold both paper supports so they sit flat on opposite sides of the rim. The bottom of the filter has to stay above where the finished coffee will sit.
- Heat the water safely. Follow your kettle maker's instructions. Blue Bottle's current pour-over guide works in a 195–205°F (about 91–96°C) range. If your kettle has no temperature readout, let freshly boiled water settle for a moment rather than guessing by touch.
- Add the coffee. Start at 10 g, medium grind. Shake the bag gently to level the bed—don't tamp or press it down.
- Wet the grounds. Pour about 25 g of water evenly across the surface, then pause for roughly 30 seconds.
- Finish in small pours. Add the rest slowly in two or three stages, waiting for the level to drop before the next pour, and stop at your target brew weight.
- Lift the bag out. Let the last of the water drain without squeezing. Lift both supports together, let the bag cool, and throw it away with the grounds inside.
Away from a kitchen, hot water is usually the hard part. The 400 ml portable electric kettle lists four temperature settings on a 300 W corded supply—it is not a battery kettle, so use a compatible outlet and check voltage and appliance rules wherever you're going. The hotel-room coffee guide walks through those checks before you pack.
How to adjust a cup that tastes wrong
| What happens | Check first | Change on the next brew |
|---|---|---|
| Coffee tastes weak | Dose, total water, and whether water ran down the side of the bag | Use slightly less water, or grind a little finer |
| Coffee tastes harsh or dry | Very slow flow, or a grind that's too fine | Grind a little coarser before touching the ratio |
| Bag drains very slowly | Fine grounds, an overfilled bag, or pours reaching the rim | Go back to the 10 g recipe and a coarser setting |
| Filter touches the brewed coffee | Mug height and final water amount | Use a taller mug, or the smaller recipe |
Change one variable at a time, or you won't know which one helped. Strength, grind and flow each fix a different problem, and sour and harsh cups have separate causes worth telling apart. Paper also shapes the result: a bonded paper filter holds back more oil than a metal screen does, which the paper vs. metal filter comparison covers in detail. A darker roast may taste better at a lower water temperature than a light one—your palate is more useful here than any single universal number.
A five-point safety and fit check
- Confirm both paper supports are resting securely on the mug.
- Keep the bag clear of the finished drink so it can't soak from below.
- Pour below the filter rim and wait for drainage between stages.
- Keep the mug on a stable surface, and move neither mug nor filter while pouring hot water.
- Use a fresh filter for every cup—these bags aren't specified as reusable.
Who this method suits—and who should skip it
Hanging-ear filters make sense for a traveler, an office worker, or anyone brewing the occasional cup who already has safe hot water and no interest in carrying a dripper. They're also handy when washing a permanent metal filter would be a nuisance. For everything else that goes in the bag, the portable pour-over packing guide is a good starting list.
Skip them if you brew several cups at a time, want to avoid single-use filters, or need a brewer that clamps securely to a wide or oddly shaped vessel. A conventional dripper from our pour-over drippers and coffee makers range handles larger batches with less fuss. One thing not to try: don't prefill and heat-seal empty bags unless your filter supplier explicitly approves that storage method and you have food-safe equipment for it.
For the first cup, try 10 g of coffee and 160 g of water. Let each pour drain before adding more. Taste the result, then adjust either the grind or the water amount for the next cup.