Reinforced Mining Bag

Reinforced Mining Bag is a 28-slot mining bag which can be crafted by leatherworkers with leatherworking (325). It is taught by, a reputation reward pattern that can be purchased in Nagrand from by the Alliance or  by the Horde upon reaching  with the Kurenai or Mag'har respectively.

Like all mining bags, this item will hold ores, smelted bars, stones, blacksmithing and mining tools, and some Primals, Motes, Eternals, etc., but not gems. See the entry on mining bags for further details.

Source
This item is crafted by leatherworkers with a skill level of 325.

The Pattern: Reinforced Mining Bag is sold by Provisioner Nasela  in Garadar, Nagrand and  Trader Narasu  in Telaar, Nagrand upon reaching  with their faction.