Reference for Chullin 213:31

מי רביעית נוטלין לידים לאחד ואפי' לשנים

A sack or a basket, even though they were made to hold water, may not be used for washing the hands.<span class="x" onmousemove="('comment',' For these do not usually hold water and cannot be regarded as a vessel for washing.');">¹³</span>

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