Our weather balloon payload is large but the payload is light. The design includes two layers. The outer layer is a hard, cardboard shell. The inside of the box is lined with bubble wrap. On the bottom face, the air bubbles are smaller, but larger in quantity. Inside the bubble wrap with small holes is medium-sized bubble wrap that was wrapped around to make it a softer surface. And the sides are lined with larger air bubbles. The larger bubbles are all connected without any flat portions of plastic. Inside the bubble wrap, there is a strip of cardboard to divide the inner housing and have the computers, global positioning system, and the batteries. The battery pack and the audio beacon collectively are 40 grams lighter than the flight computer and GPS tracker. The flight computer and GPS tracker are put into one side of the divider. On the other side are the audio beacon and battery pack. The lighter side with the battery pack and audio beacon also includes a 3-ounce block of plastic to be utilized as a counterweight. Above all of this, we installed a cardboard plate as a surface to place the GoPro camera. There is a rectangular piece of cardboard with open faces on the bottom and front for the camera to be housed securely. There is an opening for that. On the top, there is another layer of bubble wrap (some flat, some still inflated) as a lid with another tube of bubble wrap attached to it as a handle to hold the balloon.
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