I've been working on sampling and sending audio for a different project. They said that couldn't be done either, without a sharp low pass filter! Proved them wrong. Plenty of processing power left over.
Sent a few balloons up with 100g and they went over the mountain with altitude to spare! Not sure what they did on the other side. Haven't tried for awhile due to clouds. I imagine they went 10+ miles but no one called the number I wrote on them. Maybe they're still up?
I've realized that the weight of the bag is negligible compared to the payload beyond 2m width. So the capacity is proportional to the length cubed (volume). I'm going to go bigger! Using cheap tape, quality control becomes an issue until I learn a better technique. I'm thinking I might get up a Razr cell phone and small GPS. Optimistic still? @Zoomkat - Payload Mass = C x Volume. They can carry humans.