I am in owner of 5 carriers in my search for the perfect one. I finally found one that I love. I bought the tote-o-pet in black. Its wide enough so Desi not squashed, ventilation panels on the top and sides and most importantly for me.. its light weight. Oh, and plenty of pockets so I don't have to carry my purse.
http://www.celltei.com/toteopet.html