Typically federal regulations limit passengers to one small personal item (e.g. purse, briefcase) and one carry on bag (e.g. a roll-aboard). You should check with your airline for the maximum dimensions of the carry on bag before taking it. Also some medical devices (e.g. a CPAP machine, etc) may be exempt from this and might be able to be carried in addition to the small personal item and the carry on bag. But to be safe you should check with your airline or the TSA website for definitive details. This answer is just based on my personal experience (I am not a travel agent or familiar with specific laws and exact regulations, so please check with your airline).
Depends on the airline. Often one purse /briefcase plus one small bag.
Check your airline.
1 carry on
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