Speak English TP.
I ordered a nut milk bag today.
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I'm not sure you need this for cold brew unless you're planning on making gallons at a time ?
the reason is.. you'd be using coarse grinds for cold brew.. and they settle really fast to the bottom of the jar, so if you just pour over a regular smaller filter, only very little grinds will actually reach the lip of the vessel you're pouring out of..
I just use my regular stainless steel mesh sieve and it's only 3inches diameter round. I would say this small sieve is enough to filter 5 to 10 liters of cold brew before being filled up