So here is the issue -- I have always had my heart set on getting a Mono Keepall 55 or Keepall 60. However today I went into the San Francisco LV store and fell in love with the Mono Sirius 45 and 55 pieces. Part of me really likes the Sirius line because I have not seen any knock-offs of it --the Keepall seems to be readily knocked off. Additionally, the Sirius just has a cool shape, but then there is my trusty friend the Keepall. It holds alot and is just a great basic bag to have around for quick jaunts and looks a less "precious" than the Sirius to me. ARGH! What to do...what to do! Anyone have the Sirius line and can give me feedback on if they like them or not? Additionally, can they be used as a piece of carry-on luggage? Thanks!