Mog lockers are personalized storage units in mog houses that are available to members of Salaheem's Sentinels. Unlike a mog safe or mog storage, adventurers must regularly pay small fees to continue using their mog lockers. The fee is one Imperial Bronze Piece per lease period, which is either five or seven days. Several coins can be turned in to pre-pay your mog locker lease for an extended period of time.
When first given a mog locker, adventurers can agree to an Al Zahbi lease or a Vana'diel lease. Al Zahbi lease agreements last seven days, but mog lockers with those leases can only be accessed from Al Zahbi. Vana'diel leases are good for only five days, but adventurers with those leases can access their lockers from anywhere in the world -- even at nomad moogles.
Mog lockers were added to Final Fantasy XI after the release of the Treasures of Aht Urhgan expansion pack. They were implemented to add room for the unanticipated amount of gear and armor that players were accumulating over time.
Mog lockers start with 30 inventory slots. Below is a guide for expanding mog lockers to hold more items.