Rune of Holding

A Rune of Holding will, when used on a bag, increase the holding capacity of that bag from 5 slots to 10 slots.

Note: Runes of Holding will not work on Belt Pouches.

Acquisition
Runes of Holding can be bought from all merchants in all towns in Post-Searing (except for Ascalon City and Lion's Arch) at a fixed price of 500 gold.

Tip: After you leave Pre-Searing and arrive in Ascalon City, the easiest and safest way to max your inventory space (assuming you already have got a Belt Pouch) is to buy 2 bags from Arnaud, the merchant in Ascalon City, then walk straight over to the Great Northern Wall (not crossing any hostile territory) and buy 2 Runes of Holding from Rolf, the merchant at that location.

In Cantha, a number of quests give special rewards that may be traded for a Rune of Holding. The collectors can be found as follows:
 * Monastery Quartermaster (Shing Jea Monastery)
 * Imperial Quartermaster (Kaineng Center)
 * Kurzick Quartermaster (House zu Heltzer)
 * Luxon Quartermaster (Cavalon)

In Cantha, you can also purchase a Rune of Holding from Aiko in Seitung Harbor.