We offer 3 of the best commuter backpack styles in the cycling backpacks category: 1) Our regular waterproof backpacks from the Signature Series, i.e. the Signature M and Signature D backpacks with padded laptop compartments and organizers for those who don't want or don't have a rear rack for side panniers. 2) The convertible pannier backpacks from our classic pannier series, i.e. the Bug backpack and the GT-18 backpack panniers. These can be carried as a backpack or mounted pannier style onto a rack. They are probably the most versatile bags that you will ever find. 3) And finally our waterproof Dry-Pack backpack that can be carried as a backpack or mounted to our very innovative Randonneur seat post rack. This unique setup is great when you don't want a permanent rack on your bike and only need extra carrying capacity from time to time, ideal for work or longer rides. Easy on and easy off.