This item appears to be a normal glass bottle with a cork. When taken to any airless environment (such as underwater or in a vacuum), it retains air within it at all times, continually renewing its contents. This means that a character can draw, air out of the bottle in order to breathe. The bottle can even be shared by multiple characters who pass it around. Breathing out of the bottle requires a standard action, but a character so doing can then act for as long as she can hold her breath.
Caster Level: 7th
Prerequisites: Craft Wondrous Item, control wind Market Price: 14,500 gp; weight: 2 lb.