When you bike all over the city you know that it is important to have a bag that will fit all your stuff pluss some extra stuff, you know just in case. Just in case you need to repair a flat. Just in case you suddenly have to bring a 30 pack to the party. or, you know, just in case you decide to spend the night.
All of these reasons make it imperative that the bag you use on your bike must be sick, efficient and most importantly, tough as nails. Here is a roundup of some amazing bags that will be there for you when you need to stuff an extra pair of shoes, cause you have got to go to work in the morning and you are definitely trying to sleep over tonight.