You can now check if you have unlocked an inventory slot from a pouch from the description. This can be useful when in the leatherworking menu as you can select the pouch item and see the status before crafting it in case you forgot whether you used it or not.

Build 0.4.9 -Leather Pouches now show in tooltip if they have been used yet to unlock an inventory slot. You can also view this in the crafting page when you select it. -Fertilize All button will now only fertilize unfertilized plots.