I own many multi-tools, but never hike with them. Too heavy, too many tools that serve no purpose on the trail. My primary knife when hiking is a Swiss Army Classic....the tiniest one they make! Has scissors, tweezers, tooth pick, nail file, screw driver, blade, all in about an ounce. If I need a locking blade, which is rare, I'll carry a retasked kitchen boning knife, again very lightweight and strong.
Leatherman makes an S4 Squirt with scissors as it's primary tool, but no locking blade. It's a 2 oz. tool. I have the version with pliers as the primary and carry it often, but not hiking.
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paul, texas KD5IVP