Best keychain multitool under $40 and 45g (1.5oz) for featherlight everyday carry (EDC)

Don't carry a multitool? You might with these tiny, ultralight options that pack a ton of functionality in a package smaller than a tube of lip balm. I go all in to test the best tools from Leatherman, Nextool, Gerber, Ruike, and Victorinox to find out the best tool that is super light in your pocket. Thanks to ​‪@Jasonoid‬ for the question that started me on this quest.
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