Two analogies on manipulating items in a kitchen is given in the form "A : B. C : ?". The phrase "A : B" relates item A to its appropriate manipulation B. Your task is to replace the question mark (?) with the appropriate manipulation of item C, following the "A : B" relation. Your answer should be a verb which shows a way to manipulate the given object.

jug : pour. bag : ?
open
To pour something out of a jug, the lid can be removed to open it. Similarly, to get something out of a bag, the top can be opened by removing its lid..