Tire tube with slight tear.
I’ve held on to this all summer, hoping to repair the slight tear. In the meantime, I’ve purchased a new tube and am happily riding my bicycle (not currently, as that would be dangerous).
I’ve also heard that patches aren’t 100% reliable, so that’s probably contributed to my hesitation to run out and buy one. I thought about ordering patches online to save money and time, but never did.
So there you have it. Bicycle tire tube out as thing 101.