Saving backpack / Swimming educational bag

The concept of Saving backpack are two main idea :
First, we've reduced environmental constraints. Swimming education is conducted in a particular place called a pool. We have proposed ways to get education out of the water and in the water to reduce environmental constraints and generalize swimming education.
Second, it is ans easy-to-access 'bag' item. To be suitable for children in poorer world regions and among lower social classes, It can be manufactured with simple manufacturing process and low price. It will be useful and friendly to their daily lives and educational environment.