I've been to all 63 major US national parks. Here are 10 things I'd never visit one without.

I've learned that snacks are one of the many important things to bring to the national parks. Emily Hart As someone who's visited all 63 major US national parks solo, I always carry a few items with me. I stay safe by packing bear spray, a first-aid kit, and plenty of sun protection. Offline maps help me navigate parks where cell service is unavailable. After spending a decade visiting all 63 major US national parks solo, I've found that it doesn't take a lot of gear to get out into the wil...