Your makeup bag really depends on your own personal style, as well as the makeup that you carry in it. Being that I don't knw either of those things, I'll just post a few of my favorites:
http://www.sephora.com/browse/product.jhtml?id=P12693&shouldPaginate=true&categoryId=S5100
http://www.saksfifthavenue.com/main/ProductDetail.jsp?PRODUCT%3C%3Eprd_id=3776679&FOLDER%3C%3Efolder_id=3346525&ASSORTMENT%3C%3East_id=41385&bmUID=1103270278926&DCLKSLOT=6
http://www.neimanmarcus.com/store/catalog/prod.jhtml?itemId=prod16660004&parentId=cat2420731&masterId=cat000459&index=1&cmCat=
http://store.nordstrom.com/product/product_brandboutique.asp?styleid=2852867&boutique=mac&category=2377897~2377898~2378438~2383807~2383822&Search=True&keyword=makeup+bags+%3E+Beauty&SearchType=keywordsearch