Create the Fiery Dragonhide Pack

To obtain this 25-slot bag, one must collect three specific loot cards from the LoN expansion "Legacies" (released 2011-03-02):

Venomous Raptor Saddle (1/3)
Idol of Talendor (2/3)
Flame Wurmling (3/3)

When you claim these, they each come in a container that contains two items: the item itself, and a gem:

Raptor Saddle Package: Contains Venomous Raptor Saddle and Warm Ruby Shard
Worn Red Chest: Contains Idol of Talendor and Warm Garnet Shard
Wurmling Crate: Contains Flame Wurmling and Warm Sapphire Shard

There is some "Item information" printed on each gem's item description window, suggesting that one should right-click it:

Item information:

Inspect the shard more closely.

When you have only one gem in inventory, right-clicking it gives:

The shard quivers and you get the impression this item is part of a set of three. Gather the other two shards to see if there is any reaction.

When you have two gems in inventory, right-clicking either one gives:

The two shards resonate slightly. Only one more shard remains to be found.

When you have all three gems in inventory, right-clicking any of them gives:

The three shards resonate and meld together. You are momentarily blinded by a brilliant light. When you are able to see again, you notice a bright red pack where the shards were previously.

Once you have all 3 of the gems, right-click any one of them in your inventory, and they will be replaced by this 25-slot bag on your cursor.

http://everquest.allakhazam.com/db/quest.html?quest=5313