I go through a lot of bags trying to find the perfect one. Quite literally one every 3-4 months for the last 4 years.

Finally bought the 30l Peak Design backpack. Best thing ever. Worth every penny.

I can fit: Two laptops - HP 1040 and Lenovo Thinkpad S12 Two chargers for the laptops 1x 2 port USB charger for phone 8" Tablet 2 Moleskine notebooks 1 camera, either Sigma Dp1 Quattro or Sony RX100 2.5 USB backup drive Several batteries for the Sigma camera Audiotechnica m30 headphones All the infernal RSA tokens I have to carry USB cables, 2 ethernet cables 10000 mAh battery pack Other odds and ends... mug, access cards and what not