Peter Vos wrote:


If all that is true, then you really only need one person because you
can do everything in a walk.


Based on reports that each device contained about 10 lbs[*] of
explosive, a lone bomber would have started off with 40 lbs (18 kg) of
weight on their back.

Not impossible, but I'd have thought that would be an unwieldy weight of
luggage to deal with - if you're trying not to draw attention to
yourself leaving bits of it behind - and you want to move swiftly on to
the next target.
[*]
http://en.wikipedia.org/wiki/7_July_...#Investigation