People who work in a store and put things in bags for customers.
Sackers help customers and make the shopping experience easier.
Examples:
The sackers put my groceries in bags.
Can you ask the sacker to put the bread on top?
The sacker at the store is very fast.
The sacker accidentally put the eggs at the bottom of the bag!
The store always hires friendly sackers.
I want to be a sacker when I grow up.