both sizes have their advantages and disadvantages, just depends on your lifestyle. i love the 30 b/c it's not as deep as the 35 and i can get my wallet or phone faster with the 30. but that's just me. i actually can fit A LOT in my 30, granted not files, but all my essentials for the day plus more. like today was the first day that my 30 was nearly overstuffed... i had my wallet, cell phone, letters, 2 diapers and set of clothes for my baby boy, medium sized makeup bag, gloves, ear warmers, LV mini pouchette. and although it was getting heavy, it still retained a certain elegance. i'm hoping to get a 35 soon though just because i want one in case the 30 does feel small on days where i need to carry more.