Depends on what you would need to carry. I'm
always on a mission for the perfect bag. You are now touching on one of my favorite topics!!!

Not the expensive ones, but the practical ones with little compartments.
When my DD and I went to WDW in January some days we carried a backpack (actually, I made the prima donna carry the backpack....), but I carried this
http://www.ebags.com/ellington_leather_goods/airport_express/product_detail/index.cfm?modelid=46050 and it was wonderful. It was better than a fanny pack since there was a place for my ID, credit cards, a zippered place for my $ and travelers checks, etc. Also, a place for my room key. There was enough room for my cell phone, medium size camera barely (I want to get a small camera, though), tissue, chapstick, etc. The outer pocket worked perfect for the park map. I could wear it around the front of me, over one shoulder.
I wouldn't mind something a little bigger so that I could fit a little more and wouldn't have to carry the backpack, but I haven't found that yet.
I have this tote bag, which I really like.
http://www.ebags.com/ellington_leat...ofiber/product_detail/index.cfm?modelid=19143 It slips over the handle of my wheeled carryon, which is nice. They also make a smaller one, which I've almost ordered before...
Yep, I'm a bag lady.
PhD, as long as you realize that the Baggellini bag probably isn't going to be too durable. At least that's the case with the stuff I've seen. It is lightweight, which is a plus. I'm not sure if Ebags carries it--I think so.
ETA, of course Ebags carries it--the link is an Ebags link!