[Slick]

While containment is difficult, making antimatter is much more of a challenge. Making a stable antimatter atom has been done. I'm not extremely current on it, but the last thing I read was that scientists were only able to make a few atoms of anti-hydrogen (antiproton combined with an "orbiting" positron). Capturing this antimatter atom in an electric field is hard enough; and making an ounce is completely beyond our current capabilities. Not to mention that it is a really bad idea because, as the math above shows, a problem with the containment vessel will release lots of energy.