Cold brew bottle vs travel infuser bottle
Two bottles with removable filters, designed for opposite thermal situations. One is a refrigerator vessel where a long steep is intended; the other is a portable vessel where a long steep is the failure mode.
equipment
What is being compared
Point by point
| Aspect | Cold brew bottle | Travel infuser bottle |
|---|---|---|
| Where it lives | In a refrigerator. | In a bag. |
| Steep length intended | Hours, deliberately. | Minutes, after which the leaf should come out. |
| Does the leaf need removing? | Not usually; cold extraction is slow enough to be forgiving. | Yes, and the useful designs make it possible. The ones that do not produce bitter tea by lunchtime. |
| Insulation | None needed. | Usually insulated, which makes the over-steeping worse. |
| Filter core | Long, to hold a large leaf charge in a tall bottle. | A basket or removable strainer section near the top. |
| What goes wrong | Under-extraction, from too little leaf or too short a night. | Over-extraction, from leaf left in hot water for hours. |
The short answer
The two failure modes are opposite and both are designed in. A cold brew bottle asks for more leaf and more patience than people give it; a travel infuser asks for the leaf to be taken out, and any model that makes that awkward will make bitter tea whatever is put in it.
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