said by JoelC707:
For bags, I'd suggest netherweave if you have a tailor. The frostweave and embersilk cloth just doesn't drop well enough but netherweave drops just by looking at the mob. Even if you don't have a tailor to make the bags, since it's so plentiful, they're usually pretty cheap in the AH and are 16 sloters. Sure they bind unlike more 12 slots but they can transition them to bank slots when they get bigger bags for their toon.
I have the tailor. I went with the 12 slot mageweave bag to begin with for the level 10 reward for two reasons. 1) I thought I could scale the bag size for future rewards (ie maybe a 16 slot for lvl 20 reward) and 2) because of the non-bind. Since they are still playing around with new toons, they can transfer the bags to themselves this way until they settle on a main.
Appreciate the feedback!