What to get your sisters boyfriend for Christmas?

Anonymous
My sister has been dating her boyfriend for basically 2 years now. He is 23, she is 20, and I am 18. At this point she is very sure she is going to marry him in the next few years as they've already talked about it. So as I am under the impression he is going to be around for a long time I feel like I should get him something, even just something very small. However our longest conversation has been 5 minutes of exchanged sarcasm, so I have literally no idea where to even begin.
I asked my sister and she basically just said she doesn't even know what to get him so basically any ideas are better that the ones I have. Preferably something more thoughtful than a gift card, but nothing huge either that's going to be weird or trump whatever my sister gets. Basically I just want to say I know you exist and I like you for my sister but I also don't know you so we should start to kinda sorta be friends in a nonweird way... in conclusion, please help.
Sincerely,
A desperately confused person who just wants to be kind :)
What to get your sisters boyfriend for Christmas?
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