There are several ways to distribute the balloons, but I'll start with this (most orderly - for a school party). More ideas can be found below
Grab the bag of balloons and ask the kids to sit in a circle with you in a chair among them
Pass the bag to the kids. Tell the kids as the bag comes to them, they should take out a "snowflake" - balloon, and hold it in their lap until everyone has a balloon
When everyone has a balloon, let them know that they will need to pop the balloon to find the hidden paper inside.
The kids can pop their balloons by putting them underneath them and wiggling or bouncing on them to get their paper inside. This should be fun to watch
Once everyone has their paper, have them look at the number and hold onto it
When everyone has their number, the kids can go on a gift hunt to find the present that matches the number on their paper and open it up to see the fun prizes inside!