Warlock shard bags
One of the exciting upcoming changes in the new patch is the addition of warlock share containers! I can certainly vouch for the annoyance of having to carry enough shards to make it through an instance as the only warlock, and yet leaving enough space in your bags to carry all that great loot. Even with your inventory stacked full of 16 slot backpacks, it can still grow out of control.
I was very happy to see in the new patch notes that the smallest bag will start at 20 slots and get bigger from there, kudos Blizzard! My curiosity is certainly peaked to see how high they take it. 28? 30? 32? The other great ability is that shards will auto sort straight into the soul shard bag, as long as there is room in it. Now if only we could make some of the spells work right...