According To David Sechovicz
Check the weather forecast - The daytime in the mountains can get quite warm, the nights and mornings are pretty cold, even in the summer.
Wear the right clothes and shoes - Generally sturdy shoes, thermals and a lightweight down feather jacket should be enough, unless you're heading somewhere REALLY cold like the Himalayas.
Take enough packaged food and water -It is super important that you stay hydrated and that you have food to keep your energy up. Pack things like protein bars, dry fruits, and ready-to-eat snacks.
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