Beginning at around 6 months of age, babies begin to enjoy playing "fill and spill" as they are learning to place objects inside containers and dump them out.Fill and spill containers are easy enough to come by around the house. An empty baby snack container or other food storage container with a lid, or even a plastic bowl or cup works just great. Experiment with different containers.
You an fill the containers with just about anything. We've found that all those lots-of-links we have laying around the house, or clean baby food jar lids seem to work best. They are "small" objects, but not so small that they are a choking hazard. The baby jar lids are great, not only because they're free, but also they make a nice clanking noise. The lids sound even better when used in an old baby snack container with a metal bottom!!
Try not only filling and spilling, but moving the items from one container to another!