The following are susceptible to uncleanness as objects that are fit for riding upon (merkav): an Ashkelon donkey belt, a Medean saddle, a camel's pillow, and a horse-cloth. Rabbi Yose says: a horse-cloth is susceptible to uncleanness as a seat, since people stand on it in the arena. But a saddle of a female camel is susceptible to [sitting] uncleanness.

What is the practical difference between [the uncleanness of an object used for] riding upon and [one used for] sitting upon? In the case of the former the effect of contact with it is different from the effect of carrying it, but in the case of the latter there is no difference between the effect of coming in contact with it or carrying it. The pack-frame of a donkey on which a zav sat is clean; But if the size of the spaces has been changed or if they have been broken one into another it is susceptible to uncleanness.

A bier, the mattress and the pillow of a corpse are susceptible to the uncleanness of midras. A bride's stool, a midwife's stool, and a launderer's stool on which he piles the clothes: Rabbi Yose says: it is not regarded as a seat.

A fishing net is susceptible to uncleanness on account of its bag. Nets, snares, bird-traps, slings and fishermen's skeins are susceptible to uncleanness. A fish-trap, a bird-basket and a bird-cage are not susceptible to uncleanness.