As the short description says, this mod reduces the size of most vanilla inventories and power of locomotives to make non-belt logistics somewhat more difficult to handle. The stack size and rocket capacity of many machines has also been reduced not only for challenge but also for consistency, because having 50 centrifuges or heat exchangers take the same inventory space as 10 chemical plants is silly.
Recommended for use with quality as chest and armor inventory sizes still increase with it. Settings are available to tweak the size of the player inventory, vehicle inventories, and locomotive power/speed to one's liking or to revert those to vanilla values.