Interesting, contents would typically be about a dozen miniature postcards of local views.
However if the stamps are attached now, they did not originate on the bag, but are later add-ons. Reasons: way too much postage, the two dated precancels are 2 different years (they should be the same and the 15 cent stamp should also have a date, the SRC is Sears, Roebuck & Co.), the stamps would typically be attached to an addressed tag attached to the bag with the string at the upper right.
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