9. Backpack
Before you can worry about which valuables to bring, you need something to carry all that stuff in. A backpack is the most convenient way to keep everything you need on your person at all times, and it can be taken with you on most rides so you can always keep tabs on it.
If you’re willing to drop a pretty penny on one, the GORUCK GR1 can handle everything you throw at it and is comfortable to wear for long periods. It also opens flat for easy viewing by the security agent before you enter the park.