@Boidster I'll retest it sometime but the mods just unlock backpack slots AFAIK. Should be easy, just roll a fresh character and see what it displays right off the bat. 27 base slots + 10 toolbelt + 5 armor slots+ 5 clothing slots. So a fresh character would display 47. Of course there's always room for me to be dead wrong. lol
Edit: Ok, I can't count without it in front of me. Honestly the number it displays is weird.