ONLY DO THIS IF YOU WANT THE OLD "BAG FULL OF DRUGS" NARCOTICS BAG

Inside the carrytweakdata.lua file, you will find a very well labelled Narcotics section. For every line, there is a path in quotes. 
Simply replace all of those paths with the following:
"units/payday2/pickups/gen_pku_lootbag/gen_pku_lootbag_df_bag_full_of_drugs"

If you mess up the mod when doing this, I am not at fault. Do not comment on my mod page about it. This isn't a complicated swap.