Here are two vintage salt bag postcards (salt bags have been removed).  Both are in poor condition, but can be used as a "placeholder".

(1) "15878.   Salt Beds, Great Salt Lake, Utah."

Postally unused, "Postage 3 Cents With Salt Bag" box.

Circular emblem in upper left reads: "SALT LAKE CITY, CENTER OF SCENIC AMERICA.  1847   1947   UTAH CENTENNIAL."

Description in upper center back reads:

"FACTS ON GREAT SALT LAKE, UTAH
This great Salt Sea is the largest of its character in
the world.  It is fifteen miles west of Salt Lake City.
The topography of the Salt Lake Valley is similar to
the Holy Land, inasmuch as it has its Dead Sea, which
in turn is fed by the Jordan River.  The water is about
22 per cent solids, and persons can float upon its furface
without effort.  The salt industry around the shores of
the lake is carried on by several companies, and many
thousands of tons are shipped annually, obtained by
solar evaporation." 

Published by Carpenter Paper Co., Salt Lake City.

 Poor condition.  Tape stains on top edge; right corners have been clipped; light creases in right middle; salt bag missing.

(2)  "Black Rock Beach, Salt Lake City, Utah."

Postally unused, "Postage 3 Cents With Salt Bag; Made in U.S.A." box.

A Tichnor Quality Views card.  Published by Carpenter Paper Co., Salt Lake City. 

Poor condition.  Tape stains on top edge; right corners clipped; right edge torn/missing border; salt bag missing.

See my other postcards - I will combine shipping.  If making multiple purchases, please wait for me to send invoice so I can discount shipping costs.