I travel internationally extensively for business and limit my kit to my RX100 mk ii and HVL F32M flash gun plus a few accessories including table top tripod; all this fits with perfection in to a small Lowepro video camera bag and I can still shoot the vast majority of what I would be able to shoot if I lugged my DSLR arsenal with me. In the evenings I slip the RX100 in to a pocket when heading in to town for dinner with colleagues, prospects or customers and don't feel inappropriate like I would with DSLR.
For the relatively few occasions when I do travel with my DSLR and associated kit I have a laminated card that lives in the camera bag and which lists each item of equipment, its weight and the sequence in which I am reluctantly prepared to place it in my suitcase. So far at least, polite sweet talking has always won the day and I have always been permitted to board with an overweight cabin bag (economy class as well as business) but when the day comes that this doesn't work, I won't be in a tizz working out what to do.
If laptop and/or camera kit are in the hotel room I too use the "Do not disturb" sign even when it is unoccupied.