Mages’ Collective Bag is one of few ways of getting side quests in Dragon Age Origins. Note that after you finish the quest you don’t have come back to the location you received it – simly find a Collective representative in any of the numerous locations.

In Redcliffe the bag is located on a pier by the lake once you pass through The Attack at Nightfall. The bag in contains the following quests:

Careless Accusations

While traveling from Redcliffe to the location of Caravan (probably any open world travel would do..) you encounter a roup of adventurers. Tell them you are here to interrupt them and use (Intimidate). If it works they will give up witout a fight.

You can return to Mages’ Collective.

Reward: 2 gold.

A Gift Of Silence or Justice Must Be Served

Either bribe Harrith with 10 lyrium potions or deliver the note with vials to Tavish in Denerim’s Market District.

Herbal Magic

Bring ten bundles of Deep Mushroom. Check your inventory, maybe you already have them?

Reward: 1 gold.

The Scrolls of Banastor

Find five scrolls of Banastor and bring them to the Collective.

(…)

1. Gary says:

   November 10, 2009 at 5:51 am

   A Gift of Silence
   Procure 10 lyrium potions and offer them up to Knight-Commander Harrith in Redcliffe.

   The Scrolls of Banastor
   Find five scrolls of Banastor and return them to the mages’ collective.

   Herbal Magic
   Reward: 1 gold
2. Gary says:

   November 11, 2009 at 11:51 pm

   The Mages’ Collective quests from the Lake Calenhad Docks are:

   Places of Power
   Find and activate four mystical sites of power, located in the Brecilian Forest, the Deep Roads, Denerim, and the Circle Tower

   Notice of Termination
   Find the three apprentices and give each of them a Notice of Termination.
   You will find two of them in Denerim. The other is procuring a slightly rarer item from Orzammar.

   Thy Brother’s Killer
   Travel to the Brecilian Forest and slay the cabal of maleficarum.
3. Raven says:

   November 12, 2009 at 12:39 pm

   For Lake Calenhad Docks see:
   LakeCalenhad: Mages Collective
4. Gary says:

   November 15, 2009 at 9:38 pm

   Mages’ Collective – Denerim

   Blood of Warning
   Go to the four homes of accused blood mage relatives in Denerim. Select the front door of each home to smear a vial of goat’s blood on it. Once all four homes are marked, return to the collective for your reward.

   Have You Seen Me?
   Find Renold and return to the collective with news of his whereabouts. He was last seen traveling toward the Brecilian Forest.
5. J. Weezy says:

   November 24, 2009 at 6:13 am

   Gary…can you produce a map for “Places of Power”?
6. Dreadmyst says:

   January 7, 2010 at 9:15 pm

   Places of Power:

   Theres 2 in the market area. one in each of the allies.
7. origin says:

   June 5, 2010 at 3:50 am

   does anyone know where exactly the scrolls of banastor are? i got 4 in the ruined tmple but i cant find the last.