Reference for Kelim 17:3

הַסַּלִּין שֶׁל פַּת, שִׁעוּרָן בְּכִכָּרוֹת שֶׁל פָּת. אֱפִיפְיָרוֹת שֶׁעָשָׂה לָהֶן קָנִים מִלְּמַטָּן לְמַעְלָה לְחִזּוּק, טְהוֹרָה. עָשָׂה לָהּ גַּפַּיִם כָּל שֶׁהֵן, טְמֵאָה. רַבִּי שִׁמְעוֹן אוֹמֵר, אִם אֵינָהּ יְכוֹלָה לְהִנָּטֵל בַּגַּפַּיִם, טְהוֹרָה:

Bread-baskets [become pure if] the size [of their hole is such] that loaves of bread [would fall through]. Papyrus frames into which he inserted reeds from the bottom upwards to strengthen them, are pure. If he made walls for them, they are susceptible to impurity. Rabbi Shimon says: if it cannot be lifted up by these walls it is pure.

Jastrow