That can be transported on a person. Often used about military weapons systems; e.g. missiles.(adjective)
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Use "man-portable" in a sentence
"There are over 20,000 manpads man-portable air-defense systems, commonly known as shoulder-launched surface-to-air missiles, and the opposition has been able to secure a lot of this."
"Moreover, we can I think safely assume that they probably understood that technological changes would occur that would put new options on the table in the arena of man-portable firearms."
"My point is that your stance of "any man-portable weapon can be owned by anyone without a criminal record" is politically unviable."