Hi, im posting this today cause i feel like it.
You know how if you have TMI up, u see save 1, save 2 ect you can make it save banana or somethin
So here is how:

1. Go to .minecraft (go to the address bar and type %appdata% you dont have to go to run)
2. Look for the Toomanyitems.txt file, and open it
3. Under where it says "Key:o" you will see save-name1:
it will look like this:
key:o
save-name1:1
save-name2:2
save-name3:3
save-name4:4
save-name5:5
save-name6:6
save-name7:7
4. You change it to what u want so:
key:o
save-name1:Starting
save-name2:Mining
save-name3:Building
save-name4:Backup1
save-name5:Backup2
save-name6:Backup3
save-name7:Backup4
5. Save and Exit
6. RUN MINECRAFT
7. when you open your world, then go to your inventory, you save slots will be named :D
And that is how you change your slots in too many items

P.S. I would have more pictures but for some strange reason I can't upload them