Origional Thread by Blue
Text:
Topics relating to inventory management, such as space limitation and item stacking often present themselves on our boards. Which is why we wanted to take the time to inform you all of some changes that we're planning for the next content patch; beyond the implementation of key-rings, discussed here:
http://forums.worldofwarcraft.com/thread.aspx?fn=wow-general&t=7787923
# Leather (Light, Medium, etc.) will stack to 20
# Hides (Light, Medium, etc.) will stack to 10
# Cured Hides (Light, Medium, etc.) will stack to 20
# Enchanting Shards (Small Brilliant, etc.) will stack to 20
# Enchanting Dusts (Strange, Illusion, etc.) will stack to 20
# Rogue Poisons (Instant, Crippling, etc.) will stack to 20
# Rogue Poison Reagents (Essence of Pain, Deathweed, etc.) will stack to 20
# Flash Powder will stack to 20
Additional improvements in this area are always a possibility, but currently what's detailed above is the change that was decided upon after careful evaluation.