Chloroprene Mapping Balloon
This 5.5 foot (170cm) latex/chloroprene (neoprene rubber) balloon is ideal for carrying cameras up to 4,000 feet. These UV-resistant balloons can stay inflated for hours, and last for a dozen* flights if well cared-for. Buy a single balloon here without a kit to replace one that's popped, or buy one as a backup if you're planning on doing a lot of mapping.
To learn more about balloon mapping, check out the open source documentation on the Public Lab website.