Hard leather is used to train Crafting in free-to-play, and it is in reasonable demand. Because it must be tanned before it can be crafted, tanning cowhide into hard leather can be quite profitable at times. To tan hard leather with maximum efficiency, deploy a portable crafter near a bank or bank chest (for example, near the bank chest in Combat Academy), make a preset with 28 cowhide, and load it. Then right-click the crafter and choose Tan Leather. Additionally, you can use portable crafters on the one already deployed to increase its duration by five minutes per crafter.