I'd q up more for a chance at a cool mount.
A few other things the bag could have
-Rare crafting mats
-Food that gives a bigger experience boost than regular food
-Tokens for a glamour vender
-Other less rare but still cool mounts
Just so this didn't turn things completely backwards and make q's insanely long for tanks or healers, DPS could get these bags too but they should have a lower drop rate... 30% maybe. Healers and tanks could have a 90% chance to get a bag at clear. Not having a 100% drop rate would make the incentives last longer.