Morphing Sack Of Cement/Sand/Salt/Grain (CLOSED) (CLOSED)

What I'm looking for is a sack of heavy material- cement comes to mind, but maybe it could be used for other material.  I would like it to bend while a person is lifting, carrying, stacking, and maybe pouring it.  Examples would be carrying it in front of the body, carrying it on a shoulder, squatting down to pick it up, holding it while pouring. It would also be cool to have at least one version that would depict an emptied bag.  

I have scene props of stacks of bags,  but I would like to create my own stacks using the product, and showing workers stacking them or lifting them away.  The props I have are intended to be static, and not interact with a character. 

A hacky response.. how about a pillow? https://www.daz3d.com/z-pillow-talk-props-and-poses-for-genesis-3-and-8
You would need to replace the shaders and ?textures? but this set has a lot of shapes for the sack/pillows and some base poses to start with..