Portable containers (language). Or that snails embody the idea of "Omnia mea mecum porto". Therefore, like the snail, to have bags that can carry the necessary stuff, usually books/pens/passport/gum/etc. A Dickies bag served this purpose throughout college which was often loaded with way more stuff than was possible to carry comfortably or safely. That spot is currently filled with a very sweet Chrome Citizen bag. It is super and carries all the necessary things easily from work to home to KY to PA to ME to NJ to NY to IL.
If you are looking for a bag would recommend Chrome.
Recently came across this company:
If said Chrome bag ever breaks definitely would look for the next bag at the 'gull. Check out their stuff in action on Flikr. Really dig the artwork.