I am fortunate to have locker facilities at my place of employment which allows me to clean up after riding into work. I have been using a shoe box, one that came with DZR shoes I reviewed, to carry my toiletries and it never dawned on me that this was a bike hack of sorts until a guy I ran into while walking in said, "Hey, that's a neat idea." The building management have a thing against people putting locks on the lockers overnight so I have to keep the box in my office at night and then carry it with me every morning to the locker room, where I can store it for the day. The box conveniently came with some string handles that make it easy to carry . . .
. . . and it fits perfectly in the locker.
It's a hack that ensures my bicycle commuting does not have a deleterious impact upon my co-workers =)