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Question for men who are currently practicing...

Do you use a briefcase or something like it? Please discuss (including what is useful to have, what is common to have, and where to get it).

I heard that most people used those timbuk2 backs or rickshaw type messanger bags or even a backpack with a laptop
I got a bit of a non-traditional briefcase from Tumi, and I absolutely plan to use it- going to bring my timbuk2 tho as well