The Increased Stack Mod increases the capacity of stacks by 10 times. Stacks with meat, hides and drugs remained unchanged.
There is an even more increased stack version of this mod (increased by x4) that you can download here.
Increased Stack Mod Review
If it bothers you that your storage areas get filled with different piles of the same resource, the Increased Stack Mod will allow you to pile them up in larger stacks for better storage management.