Steps

We need to weigh everything (separate)
Then we weigh everything in the box
Test the boxes water proof without the camera, phone, etc..
Then put the camera and phone in the box and put it in water
Checking the GPS in different temperature

Design
The box will have wire/string attached to handles- the parachute strings will be attached to these strings on the handles. The top of the parachute has a loop that the balloon strings will be attached to.