Coal bag

The Coal bag is a reward purchasable from the rewards trader for 4,000 Dungeoneering tokens. It requires a Mining and Dungeoneering level of 35, however at least level 40 is needed to earn the tokens needed for coal bag. Only one coal bag may be in the player's possession at any time.

The coal bag holds up to 27 pieces of coal. When smelting or superheating, coal in the bag will be used before the coal in the inventory. It is refillable just like the rune essence pouch.

This item cannot be traded or dropped but it can be destroyed. Mined coal is not automatically stored into the bag. Instead, players must manually use a coal on the bag. When coal in the player's inventory is used on it, all pieces of coal (up to 27) are deposited into the bag.

Uses
As this bag substitutes for a maximum of 27 coal, it is useful for carrying extra ores to a furnace when smelting bars. The goal on each run is to get the maximum amount of bars per inventory.

The first column identifies the type of bar to be made. The second indicates how many pieces of coal should be in each bag. The third represents how many of the primary ore (Iron, Mithril, Adamant, Runite) is required. The fourth column represents how many free inventory slots remain. The fifth column shows how many bars are produced. The last column indicates the experience received from smelting a full load (including coal in the coal bag) of that ore. It also never un-charges.

Blast Furnace (starting with an empty inventory)

Other Furnaces (starting with an empty inventory) Superheat Ores (start with nature runes and a fire staff equipped)

Trivia

 * Coal in the coal bag does not add to the total weight being carried by the character.
 * On 21 April 2010, the price of the Coal bag went from 20k tokens, to only 4k.
 * Mod Chris L stated on the Live Q&A New Skill - Answers that the coal bag originally only meant to hold 10 coal "but when I went ingame to test it myself after making it, I realized it was a bit rubbish! I ended upon 27 as it meant you could smelt more runite ore per inventory, it worked out nicely".
 * Using an ore, instead of coal on the bag will result into nothing, not even the message "Nothing interesting happens.", unless the bag is full, than it will give "Your coal bag is already full."