Abyssal Bag

The Abyssal Bag was the last soul bag created prior to the Soul Shard change to warlocks in Cataclysm. It is now a 22 slot bag. This is one of three 22 slot bags that can be created by tailors, and unlike Glacial Bag, there is no cooldown to create this bag.

Source
This item is created with Tailoring (435); taught by Pattern: Abyssal Bag.