Bottomless Bag

The Bottomless Bag was one of the largest containers in World of Warcraft, before the release of Burning Crusade. It is one of two crafted 18-slot bag currently in Kalimdor and the Eastern Kingdoms. See below for the other bags.

Source
This item is crafted by Tailors with a skill level of 300.

The components are:

The pattern is a very rare World Drop.

Since the materials are quite expensive it is not economical to make these, especially since most high-level tailors would prefer to get the skill tick from making an.