Backpacking Checklist

I need a complete backpacking checklist so I can pack smart and avoid forgetting critical gear on the trail.

I am planning a backpacking trip to [DESTINATION] for [TRIP_LENGTH:select:an overnight (1 night),a weekend (2-3 nights),a short trek (4-5 nights),a full week,an extended trip (8+ nights)].

The season and expected conditions are [SEASON:select:spring with cool mornings and mild days,summer with hot days and warm nights,fall with cool temps and possible frost,winter with freezing temps and snow,shoulder season with unpredictable weather,desert with extreme heat and cold nights,tropical with rain and humidity].

The terrain is [TERRAIN:select:well-maintained trails with campsites,remote backcountry with no facilities,alpine and above treeline,desert canyon or arid landscape,dense forest and river crossings,coastal trails with beach camping,mixed terrain with elevation changes].

My experience level is [EXPERIENCE:select:beginner going on my first trip,intermediate with a few trips under my belt,experienced and comfortable off-trail,ultralight enthusiast focused on minimal weight].

I will be sleeping in [SHELTER:select:a backpacking tent,a hammock system,a tarp or bivy,a mix depending on conditions].

My cooking setup preference is [COOKING:select:full cook kit with stove and pot,boil-only with a lightweight stove,no-cook cold meals only,campfire cooking where permitted].

I [WATER_SOURCE:select:will filter water from streams and lakes,will carry all water needed,need a mix of carried and filtered water].

Special gear or considerations: [SPECIAL_GEAR?] (such as bear canister required, fishing gear, camera equipment, dog supplies, trekking poles, or any medical needs)

Build me an organized backpacking checklist grouped into clear categories: shelter and sleep system, clothing and layers, food and cooking, water and hydration, navigation and safety, first aid and emergency, personal items, and extras. For each item, note the approximate weight if possible. Flag the ten essentials clearly. Suggest what to cut if I want to go lighter and what to add if conditions turn bad. Include a pre-trip checklist covering permits, trailhead logistics, weather checks, and emergency contacts. Tailor every recommendation to my specific destination, season, terrain, and experience level rather than giving a generic list.