My husband has had a metal USB stick that is shaped like a key and is very thin specifically for this purpose. I don’t know the brand as it’s not printed on it, but it’s lasted him a long time and I would assume it to win this contest by a landslide. Excellent analysis, very interesting!
For reference, it looks like this (not the same brand):
This may seem basic, but I think some people really need it. I have a hard time remembering things like birthdays and such. So I make sure to add people’s birthdays into their contact info on my phone. Then it will show up on my calendar as a different color and I can see it coming up and actively try to be on top of it instead of it passing and feeling guilty for forgetting. Maybe you don’t care about everyone’s birthday in your life, but I at least try to add my friends and family so I can reach out to them or try to remember to send a gift to little ones that are far away, etc.