When Felix took that balloon ride last year, I got the impression that that was the biggest balloon in the world. Seems that is not the case. This one is 20% bigger in height, and one third bigger in volume. It doesn't look like much when it is launched, but then we have air down here near sea level. Get up there in the stratosphere and there is hardly any air, which means hardly any air pressure, which means the balloon is free to expand to its full glory.
This isn't the BRISSON launch, but a similar one done down in the antarctic. You can see the BRISSON Launch on this Facebook page.