Yes, I agree with Ragon. Unpacked Bitmaps are things that shouldn't be, even in times when Harddisks have lots of GB of space. The free space is different from the total space !
I've recently packed a demo savegame. It was about 20 MB big, but compressed it was almost 2 MB.
Please, folks at Larian, please try to at least compress the bitmaps !