If you have a lot of something, you have sacksful of it.
Having sacksful of something can make people think of having a big amount of it, maybe too much.
Examples:
She has sacksful of toys in her room.
We have sacksful of apples from the tree.
The store has sacksful of candy for Halloween.
He has sacksful of energy in the morning!
I have sacksful of homework to do tonight.
The farmer has sacksful of potatoes in the barn.