Bike tools
My Campagnolo levers need a Torx T20 for the clamping bolt. How annoying. I don't carry that size with me.
My everyday tool kit is this, and 2 tire levers. I had a scrap of rubber membrane roofing, sturdy rubber sheet about 1mm thick. I bring the L wrench sizes that are used on my bikes. It's 45 grams as shown.
I've looked at multitools, but still keep this roll instead. It's slower to take it out of the plastic bag, then take off the slices of bike tube that are the rubber bands, but it's nice to have real L wrenches instead of the stubby ones on the multitools. And this roll protects everything else in the bag from wrench damage, and there's no clanking noises from the tools.