Quoting%20commentary for Kelim 23:3

מַה בֵּין מֶרְכָּב לְמוֹשָׁב. מֶרְכָּב חָלַק מַגָּעוֹ מִמַּשָּׂאוֹ, וּמוֹשָׁב לֹא חָלַק מַגָּעוֹ מִמַּשָּׂאוֹ. תָּפִית שֶׁל חֲמוֹר שֶׁהוּא יוֹשֵׁב עָלֶיהָ, טָהוֹר. שִׁנָּה בָהּ אֶת הַנְּקָבִין, אוֹ שֶׁפֵּרְצָן זֶה לְתוֹךְ זֶה, טְמֵאָה:

What is the practical difference between [the uncleanness of an object used for] riding upon and [one used for] sitting upon? [An object] ridden upon has a distinction between contact with it and carrying it, but in the case of [an object that is] sat upon, there is no difference between contact with it and carrying it. The pack-frame of a donkey on which he sat is impure, but if he changed the size of the spaces or if they have been broken one into another, it is susceptible to impurity.

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