1. Open your UCE and atatch to Engine.exe
2. Make sure the Backpack that you start out with is on.
3. Search for 1 (Slots)
4. Equip Advanced backpack
5. Search for 2 (Slots)
6. Repeat until you have about 6 addresses
7. freeze them all at 4 for max slots, or at 5 for santas sack.
8. i went back and found out which address was the right one, you dont need to.
me posting it here