Make the plan first
There is no single packing list that makes every trip appropriate. Start with the route, forecast, expected time outdoors and the needs of your group. Look at the relevant land manager’s guidance before deciding what belongs in the bag. A short path near home and a remote route create different demands.
Keep useful items accessible
Put navigation, weather protection, water and regularly needed personal items where you can reach them without emptying the pack. Protect items that must stay dry. Check that your light works and that equipment you rely on is charged or has suitable spare power.
Try the load before you leave
Walk a little with the packed bag and adjust it for comfort. Notice loose straps or hard items pressing against your back. If you are carrying shared supplies, agree who has what; do not assume another person brought an item that everyone needs.
Review instead of guessing
After the outing, note what was used and what was missing. Keep necessary contingency supplies even if they were not needed that day. The goal is a considered pack, not the lightest possible bag at the expense of the conditions you may meet.