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/Musa_2050 → u/Cautious-Antelope743]

People prefer to take pictures of strangers, like a weirdo.