I buy these to hold my cereals and chips closed. They have the grip to not fall off and keep the rolled up bag closed almost air tight. Great for ground coffee too. Here in S Florida the humidity and insects are kept out of everything I use the clips on.
It is helpful in gathering a small "pile" together to file as a group of docs. Paper clips are good for a couple of sheets but these fasteners are 'good' 'reliable' for larger collection of docs.