שָׁלֹשׁ חֲמָתוֹת וְשָׁלֹשׁ תּוּרְמְלִין הֵן. הַמְקַבְּלִים כַּשִּׁעוּר, טְמֵאִין מִדְרָס. וְשֶׁאֵינָן מְקַבְּלִין כַּשִּׁעוּר, טְמֵאִים טְמֵא מֵת. וְשֶׁל עוֹר הַדָּג, טָהוֹר מִכְּלוּם: There are three different types of water skins and three different types of shepherds’ wallets:Those that can hold the prescribed quantity are susceptible to midras uncleanness; Those that cannot hold the prescribed quantity are susceptible to corpse uncleanness; And those made of fish skin are free from all uncleanness.Mishnah Kelim 24:11

שְׁלֹשָׁה עוֹרוֹת הֵן. הֶעָשׂוּי לְשָׁטִיחַ, טָמֵא מִדְרָס. לְתַכְרִיךְ הַכֵּלִים, טָמֵא טְמֵא מֵת. וְשֶׁל רְצוּעוֹת וְשֶׁל סַנְדָּלִים, טְהוֹרָה מִכְּלוּם: There are three different types of hides:That which is used as a rug is susceptible to midras uncleanness; That which is used as a wrapper for vessels is susceptible to corpse uncleanness; And that which is intended for straps and sandals is free from all uncleanness.Mishnah Kelim 24:12