I’m looking for a new bag since I’ve been using my big red tote to work daily. I have other bags at home, including a black one middle-brand one that has been with me for nine years! I just don’t have one as big as the one I’m using now that I could use to put my books, netbook, and girlie things. And of course trash, for when I couldn’t find a trash bin I just put it in my bag 
To shop for bags, I would visit Shopwiki. They have a Bags and Luggage Shopping Guide to help you choose a bag that will fit your needs. Because not all bags are created equal.
When I had my son, I spent time looking for Diaper Bags. I ended up having three at home – a black tote, a sky blue messenger style diaper bag and a dark blue bottle bag.
We also have several Luggages here. I have two weekender bags – one in red and another one in stripes. Our storage area houses three huge wheeled traveler bags – red, green and black; and two smaller ones that my husband uses when he travels.
Why “Shopwiki”? Just like Google, it’s a comprehensive shopping site that shows you everything that’s available on the WWW. I’ve actually seen a couple of on-sale items there from department stores like Macy’s that are not as easy to find when you visit their site 
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You should also try looking at this site.
http://fyhshop.multiply.com/ they sell really cute bags. I am very lucky to meet the owner (Anna?!) when I dropped by their shop (for the very first time) 2 days ago. I told her the color I wanted- hot pink or violet with cool prints. I hope she can make one for me.
http://flairinthecity.blogspot.com/2007/07/follow-your-heart-boutique.html — love the pics here.