Commentary for Chagigah 52:5

ותיפוק לי דכלי עץ העשוי לנחת הוא וכל כלי עץ העשוי לנחת לא מטמא מאי טעמא דומיא דשק בעינן מה שק מיטלטל מלא וריקם אף כל מיטלטל מלא וריקם

But it should be derived [from the following law], as it is a wooden vessel made to be stationary, and any wooden vessel made to be stationary cannot become impure. What is his reasoning [that he did not cite this law]? We require it to be similar to a sack. Just like a sack can be moved full or empty [and can become impure], so too everything which can be moved full or empty [can become impure].

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