This is a great idea for kids birthday parties, balloons with surprise inside. Start with some large balloons. Cut out a bottle as shown in the picture and use it as a funnel. Take a balloon, roll up the neck a bit and carefully stretch it over the mouth of the funnel. Then, carefully start inserting the candy, treats and money, stretching the balloon as you go.
Gently slide the neck of the balloon off the bottle mouth. When Tonia from The Gunny Sack was making the birthday balloons, she wanted to fit a lot of stuff in them. So, after stuffing as much as she could into the balloons and taking them off the bottle, she blew up the balloon so that the candy fell to the bottom. Such a cool idea and the kids will love this.
Source The Gunny Sack