If the covers of utensils have handles, they may be handled on Shabbos. Rabbi Yosi says that the rule about handles only applies to covers for the ground (such as the lid of a well) but that covers for utensils may be handled whether or not they have handles.
One may remove even several piles of straw or grain on Shabbos in order to make room for guests or to make room for students in the study hall but one may not empty out the silo. One may remove ritually clean terumah and demai (doubtfully-tithed produce), first tithe from which terumah has been taken, second tithe and sanctified items that have been redeemed, and dried lupin (a type of flowering legume) because it is eaten by the needy. One may not remove tevel (untithed produce), first tithe from which terumah has not been taken, second tithe and sanctified items that have not been redeemed, or wild onions or mustard seed (which cannot be eaten “as is”). Rabban Shimon ben Gamliel permits one to move the wild onions because they can be eaten by ravens.