Damn, this bag is too full.. and this one.. and this one...

Running out of bag space? Never fear, Drysc from Blizzard has announced that there will be some changes made to the way items stack in patch 1.11! This should hopefully make for more room in the bags for many characters!

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

You can read the original post and the full thread here!