A helium or hydrogen filled balloon could be used for
transporting goods but there are many problems involved in doing
so.
First, if hydrogen is used, there is a risk of the
balloon catching fire and to prevent it would require the use of a special material to
make the balloon.
Second, such balloons would be very large
and special areas for their landing is required. Also, during flight, the large number
of airplanes that fly today could easily strike a
balloon.
And finally, the speed of these balloon is not
very high compared to modern airplanes and though they can travel in a straight line
between destinations, they will take a very long time.
I
can think of a few other reasons why they haven't been put to use as you say they can,
but the answer will get too long.
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