1,743. Inner and Outer Vessels
Hilchos Geirushin 5:7
Pursuant to the previous halacha, let’s say that there are two vessels, one inside the other, the inner vessel belonging to the woman and the outer vessel belonging to her husband. If he throws the get towards these vessels, divorce is not effected even when the get reaches the airspace of the inner vessel; it must come to rest in the space of the inner vessel for divorce to be effected. This only applies when the vessel is lying on its side and doesn’t have a bottom; if it has a bottom, then divorce is not effected even if the get comes to rest on the bottom. This is because when the wife’s vessel is in the husband’s domain, she cannot acquire a get through that vessel unless the husband doesn’t care about the place that it occupies.
Hilchos Geirushin 5:8
If a man tosses a get to his wife while she’s in his house or courtyard, divorce is not effected until the get reaches her hand or a vessel that belongs to her and to which the husband doesn’t object having on his property, like a basket or a little jug. Similarly, if the get lands on a couch ten handbreadths high (about 30”) that belongs to the wife and on which she is sitting, then divorce is effected because the couch is considered a domain separate from the husband’s and he doesn’t object to the space occupied by its legs.