Hello, A few times per year, I walk the floor of a tradeshow, and am exploring the idea of bringing a supplementary bag to carry the following, instead of my 40L carry-on backpack. Microsoft Surface 3, chargers, and cables Other misc chargers and cables 200 or so business cards in a "Really Useful Box" 0.3L size Bose QC35 in its zippered case Power strip & extension cord Tisses, small container of listerine 2x 16-20oz watter bottles that I bought at the airport or the tradeshow and refill throughout the day I need to have easy access to the water bottles. Ideally, it would be lightweight enough that I could pack it in my (very large) checked suitcase. Throughout the show, if I am having a meeting or a longer conversation at a booth, I need to be able to take it off and put it back on quickly, while wearing a suit. The bag doesn't necessarily need to be very "business-looking". Black is a plus. Any suggestions?