This is part of a short, three-mission chain for inscription professionals that begins with the [item=114984] (a random drop for players who have chosen inscription as one of their professions).
Clicking on the satchel begins the first part, A Mysterious Satchel, and turning that quest in to [npc=84724] advances the short quest line.
In the second part, [npc=84724] requires you to gather 5 [item=114986] from the [npc=82323]s and/or [npc=82318]s that inhabit Umbrafen. The drop rate is NOT 100%, so one may need to slaughter more than five 'bats and/or giants.... my experience was about a 50-50 chance for a drop (wowhead's numbers are skewed, as it's an inscription profession-only thing).
The final quest requires one to go into the small building near [npc=84724] and talk to [npc=84728] to complete the quest and receive [item=111815] and [item=111923]. I had already known them both, so I ended up deleting the [item=111923] and selling the [item=111815] to a vendor for 150 gold.