Commentary for Avodah Zarah 149:5

Gurgei - [wicker-net] bales, in La'az "ributi," [which] are wrapped around the "tapuach" [i.e. heap of grape pulp] so that the grapes do not scatter because of the weight of the beam [which is used to press them]. And Rav Hai [Gaon] commented [that] "akalim" as taught here are like "a bale ["ekel"] [used for] an olive press" (Sanhedrin 26a), made as a type of basket weaved into a net. After squeezing the olives the "gefet" [i.e. peat made of olive peals] is placed in that "ekel" [i.e. wicker-net] and [one] presses it [with a beam] and because of the weight [being applied] the remaining drink is drawn [from the peat made of olive peals]. These are "gurgei d'Armaei" [i.e. the wicker-nets of the Gentiles]. How is it scoured?