I shrank all the bag slots to be 75% of normal size. I removed the picture of the bag. I then added 4 slots to the bag model.
the 4 slots are
Base-inventory#1 & Base-inventory#2
Primary Weap & Secondary Weap
then the rest of the bag.
The over all size of a bag has not increased much at all.
This is a handy mod for quick swapping of weapons (due to weapon slots), Potion drinkers, Illusion mask lovers, J-Boot Owners (base inventory slots will let you click all those items except the half-elf mask.)