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This three-sided pole on an airport tram
(sh.itjust.works)
I had never seen one of these before today. They're great. Way better than reaching for a single pole in a crowded car and wrapping your hand around some stranger's fingers. And If you have the whole thing to yourself you can hook your arm through it.
Subway rider here. I will always have one arm through my bag handle. People often get stuff stolen on commuter trains in a lot of cities.
People yoink stuff and jump off the train right before the door closes.