I've been playing around with using Bullet physics to inflate and deflate objects. I've put together this example to show how Bullet can be used to inflate an object and fit it around another object, using an inflatable water wing.

The zip file is here: http://www.morphography.uk.vu/~cagepage/2016/water_wing_Bullet.zip

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.