Bowl, child-safe household items
My son loves to take things in and out of bowls and bags. He works at it like it is his job. I keep a bowl on our dining room table full of adult-items suitable for a baby (old tube of shampoo, wooden spoon, sunglasses case, basting brush, etc.) and whenever he gets really agitated I take the bowl down and give it to him. He loves it because he knows it is his daddy and mommy's things, and not his baby toys. When he's done, I just scoop them all up and put the bowl back on the counter. It usually buys me twenty to thirty minutes of time.