I don't think anyone has ever brought it up, but i myself often run into lack of bag space. One google search later i found this link...
http://eq.magelo.com/bags.jspaI know some of them are gonna be unavailable, but since the last update you did, there may be some bigger bags available for us to use. The ID's to them are on the in the URL once you click on them and on the right side of the page. It's not a i want this now thing, maybe something simple that you could do on your upcoming vactation if you get bored
Open to discussion!