[at-l] Horse and hiker

[wolferrae at earthlink.net (Rogene Beers)]

Recently saw a documentary on New york city sanitaion
and "Typhoid Mary."  As much as Mary being a culpret in the death of over 20
people. It siad  horses produce 25 pound of manure a day. New York was a pil
of manure the turn of the century for sure.
How can some sort of bag on a horses backside carry       the equivalant
weight to a lightweight  light back pack?
Rogene