Day to day, I use a messenger bag to haul stuff back and forth to the office. My bag has a rain fly which, while nice to have, isn't convenient to carry all the time. On a particularly snowy day that I needed to bring two laptops for work and some camera equipment for after work, I moved everything to my Timp. (I also have the Brenner laptop sleeve, which was perfect for hauling one laptop in the Timp pocket and the other securely in the Brenner in the main compartment). The weatherproofing was the deciding factor and I have since retired my messenger bag. Couldn't recommend this enough.