Sort of like a grain of sand will float in the air but a bag full will drop on the ground.
But then again if you were in space far from any large masses, I mean really really far, then you could hold out a grain of sand and it would just go wherever you sent it, same as the bag, and it would not be attracted to you even though you would be the absolute largest mass around, unless you were spinning unbelieveable fast.
I think that is it but am not a physisist, hope you don't mind but I thought it was interesting.
Hopefully someone who might really know will post and I will read it also.
Thanks,
A.