My Dad's got 10000uF capacitors for his audio
amps, and they're the
 size of a coke can.  I reckon 100 such capacitors would fit in my
 schoolbag, at worst..." 
That's a big schoolbag.  I regularly carry five dozen 341-ml aluminum
cans in my backpack (they're iced tea cans, not pop cans, but they're
standard pop-can size), and it's a big backpack and they fill it right
full up.  100 would be five-thirds as much, more like a sports
equipment bag.
And, of course, it depend heavily on the working voltage.  a 1Fd 5V cap
is generally smaller than a 1Fd 50V cap.  (And, now that supercaps have
shown up, low-voltage caps have gotten even smaller.)
  And that's how I learned that school wasn't
going to teach me
 anything useful, or basically true. 
Well, you'd already learned to sanity-check claims you hear, which is
arguably a more valuable lesson. :-)
/~\ The ASCII                             Mouse
\ / Ribbon Campaign
 X  Against HTML                mouse at 
rodents-montreal.org
/ \ Email!           7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B