The rune pouch is an item that can store 16,000 of three types of runes. Players can use the runes from within the pouch, saving inventory space. If a player dies during PVP, they will lose the rune pouch. If a player is killed by another player, neither player will receive the rune pouch. Since the death mechanics update on 22 May 2015, it is kept on death outside of PVP, despite what the current "Items lost on Death" menu claims.
It can be purchased at the Bounty Hunter Store for 1,200,000 points. Players cannot own more than one rune pouch. Players often buy Mysterious Emblems in bounty hunter worlds in exchange for bounty hunter points. It takes 24 tier 1 emblems to purchase the Rune pouch. Players like to sell tier 1 emblems for an average of 100k each, so you can expect to pay around 2.4m if you want to buy the rune pouch off of only tier 1 emblems. However, you may be able to obtain one tier 7 emblem usually going around 1.3m. Your third option is to kill wilderness bosses for emblems.
If a player attempts to store the rune pouch while the storage interface is open, the message "Don't be silly." appears in the chatbox.