This fun activity was inspired by this post: http://playcreateexplore.blogspot.com/2013/01/baby-oil-sensory-bags.html Definitely head on over there to read the how, why, and precautions for this activity.
Quartus had so much fun with this! I taped his bag to the kitchen window so I could keep him close by while the older 3 worked on math at the kitchen table.
The kids and I declared that this was his "science" time. He squished, smacked, observed, and explored his bag and excitedly announced his findings.