If you are going to implement this (I hope you do it very soon).

Then please also consider implementing the means to move items between bags in an easier way then drag and drop. I really liked that I could right click the item I wanted moved to the crafting window, cant you enable the same function to move items between 2 open bags ? and if more then 2 are open then we would have to use drag and drop. An auto sort function would also help.

Try moving 100 different cloths and cloth scraps from your inventory to a basket on the ground and also put it in the right pile after color (234243 shades of grey) and pattern off the icon. It would be much easier to just right click it and it would move itself to the right pile in the other opened container.