A day hike in the mountains calls for more than water and snacks. Rain gear, a map, a headlamp, and a basic first aid kit should be in every pack, even on clear mornings. Weather in high terrain can change within an hour, and trails are often unmarked above the treeline. Tell someone your planned route and expected return time before you start. Check the forecast twice, carry extra layers, and turn back early if conditions look unstable rather than pushing to the summit.