0psymansaysBest Answer 8 years ago ReplyUpvoteI would look at theGoodyear blimp as an example. It has (as far as I know) two passengers, and a decent control area for them to sit in. My best guess is that it weighs between 800 to 1200 pounds. It looks like the balloon part is around 50 feet long, and 15 feet in diameter. This works out to maybe 2500 cubic feet of helium. So... less than 1000 square feet (10'x10'x10') should lift a man. Of course, getting back down safely is a serious concern. At bare minimum, you should take along winter clothes and a medical oxygen tank and mask, so that you can keep from losing consciousness while in the air if you go too high.