Iron Flask: These special containers are typically inlaid with runes of silver and
stoppered by a brass plug bearing a seal set round with sigils, glyphs, and special
symbols. When the user speaks a command, he can force any creature from another
plane into the container, provided the creature fails its saving throw vs.
spell–after magic resistance, if any, is checked. Range is 60 feet. Only one
creature at a time can be so contained. Loosing the stopper frees the captured
creature.

If the individual freeing the captured creature knows the command word, the
creature can be forced to serve for one turn (or to perform a minor service which
takes up to one hour). If freed without command knowledge, dice for the
creature’s reaction. Any attempt to force the same creature into the flask a second
time allows it +2 on its saving throw and makes it very angry and totally hostile. A discovered bottle might contain:

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