Help me build useful first aid kits for my crew

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I’m the office manager at a small (20 employees) construction company and realized today how crappy the premade first aid kits are. Or are they useful? If you guys could have a custom first aid kit in your truck, what would you want in it? Seems like premade kits are overpacked with things you’d never actually use and then under stocked with what’s actually useful if you get a bad cut. UPDATE: they are carpenters mostly, we do general contracting and some service/repair/maintenance work. subm...