Electronics
Yes, you can go low/no-tech and conquer the Kalalau Trail old-school, but let's face it: The right electronics make the experience more enjoyable and safer. Here are some of the electronics I like to bring:
Steripen Adventurer
This UV light is effective at eliminating harmful microorganisms including leptospira. It has long-lasting batteries and even works in slightly cloudy water.

Garmin InReach Mini 2
This is simply THE go-to satellite communication and navigation device. I would not go without it. The second iteration of this unit has a lot of improvements including incredible battery life.

Garmin Instinct 3 Solar
This watch has all you need including GPS, barometer, altimeter, compass, sunrise/sunset times, and more. It uses solar power to charge, so you never have to worry about the battery.

Black Diamond Rechargeable LED Headlamp
This headlamp has plenty of modes (including red light) and doesn't require batteries as it can be recharged. I've never used more than a quarter charge during my trips to Kalalau.

MPOWERD Luci light (solar)
Inflatable light, great for camp with good battery and solar, so you never run out of juice.

Anker 20,000mAh portable charger
I've run out of power for my electronics before with a 10,000 mAh battery. That won't happen again thanks to this powerful battery pack which keeps everything powered!

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