I have decided to put off my purse ban and have decided I want a Keepall 50, but I can't decide though if I should get the 45 or 55 instead? I want a duffle that I can take with me on weekend trips, to the airport - as a carryon, don't want to check it. To me the 45 seems more like a gym bag, I really liked it though and the 50 just seemed to work perfectly....or do I go with the 55? I'd love to hear what made you go with the size you did - i am just talking aobut your 1st Keepall purchase, I know many of you have them in every size - what did you go with 1st and why? PS: what are characteristics I should look for in picking the perfect Keepall, I know many of you sit there and go through EVER SINGLE item of the LV you want looking for IMPERFECTIONS before you make your decision - please share! Thanks!!! Thanks!!!