Mishnayos Keilim Perek 4 Mishnah 2

ואינה יכולה להטלטל בחצי קב גרוגרות – because it is cracked/broken, and the dried figs weigh down upon the broken parts completely while being carried. And therefore, its measure is one-half-of-a-Kab, which is the measure of one meal. For a Kab of dried figs is the measure for two meals as it is proven at the end of the Tractate Peah (Chapter 8, Mishnah 5): “[When dispensing poor man’s tithe], they may give to the por at the threshing floor no less than…one Kab of dried figs.” But everything that is not worthy to carry in it the measure of one meal is like something that is broken.

גיסטרא (see Tractate Kelim, Chapter 2, Mishnah 6 – something defective/broken) – an earthenware vessel that is split into two, and it becomes two sides.

שאין שיריים לשיריים – we have compassion upon a complete vessel and because of a small crack, we don’t pour into it [liquids] and we bring the remnants of the vessel, that is the shards of a vessel and place them underneath it. But the shards of a vessel when it is cracked it releases liquid we throw it out, for we don’t say: bring a shard of one vessel to place underneath the shard of this vessel.