I gave him a quick demo by putting a small treat into two compartments. One was open and he snatched it up. Then he watched me open the other so he could grab the second treat. Then I picked it all up and loaded it all up. Then I gave it to him and this is what happened (only the first minute is really worth watching):
That moment he was distracted was because Kiwi the Grey flew over our heads. He didn't get the last two, but came back to it later.
I love this dog.