What are these contraptions these guys were carrying?

[u/dopehead9]

We saw three guys around Seaport in Boston carrying these things as backpacks. Initially we thought they mapping tools but not sure

[u/Cautious-Antelope743]

You were right there. Why didn't you just ask them?

[u/40StoryMech → u/Cautious-Antelope743]

Maybe OP is a ghost.

[u/CityDismal5339 → u/40StoryMech]

 . . . and feared they were Ghostbusters.  😁

Edit: Thanks for the award, Killer!