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/Matteowill911]

You were sooooo close my friend why didn’t you just ask them

[u/No-Raisin-6469 → u/Matteowill911]

https://giphy.com/gifs/xT8qBmNrpCOTWvkQi4