Gather your materials--stickers, several 35 mm film canisters, and small objects that make different sounds. Fill each fill canister with different objects, making a match for each object (fill two with rice, two with paper clips, two with jingle bells, etc). Then put a sticker on the bottom of each canister, making sure that the matching sounds also have matching stickers on the bottom. The purpose of the stickers is to provide the child with a way to self correct, which is also a core belief in Montessori schooling. He picks up two canisters, shakes them, and determines if the sounds match. He can turn them over to see if the stickers match--if they do, he has indeed found a match.
I stored mine in an old egg carton, but they can be stored however you wish. Also, I posted on craigslist in the wanted section for someone willing to donate film canisters and only had to wait about a week for a response, so if you're wondering how I got so many film canisters when everyone is using digital these days, that's how! Also note that since the film canisters do open, this would only be appropriate as a supervised activity, or for children who know not to put things in their mouths. You could also try hot gluing them shut, but since my kids are older, I didn't bother with that.
Little Bean did really well with this activity. He was able to match all the sounds. The hardest part for him was just being willing to see the activity through until the end. Miss O really enjoyed shaking the canisters, but she wasn't able to match them, except for the ones that were very obvious, like the rice. Try this with your little one. It's very quick to make and can be played again and again!