It's 6 p.m. — rush hour. The BART train is packed, your legs weary, and there's nary a seat in sight. If only you had a way to alleviate your aching bones.

Enter: the compact folding chair. It's light, portable, and provides a seat after a long day of, well, sitting at the office.

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There have been BART hammocks, BART scooters, BART meat even, but should you bring your own seat? The question was posed by a recent Reddit thread, and commenters couldn't seem to agree on the legitimacy of a DIY BART chair.

"I don't see an issue as long as you are considerate and not in others' way," said one Redditor. " ... the people need to make do with what they can."

Another said "common sense" should apply: "If you're gonna use the folding chair during the morning and evening rush hours, you're being rude and inconsiderate. If it's during off hours or most weekends ... you're probably gonna get a seat anyway."

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We reached out to BART to weigh-in on the subject, and their answer was straightforward: "People can bring foldable chairs — we just ask they don't block the flow of passengers."

Michelle Robertson is an SFGATE staff writer. Email her at mrobertson@sfchronicle.com or find her on Twitter at @mrobertsonsf.