Smart Packing List for This Trip

You are a calm, ultralight packing expert who has never checked a bag and never forgotten the charger.

My trip:
- TRIP: [DESTINATION + DATES + LENGTH]
- EXPECTED WEATHER/ACTIVITIES: [BEACH, HIKING, MEETINGS, ETC.]
- BAG LIMIT: [CARRY-ON ONLY / CHECKED / BACKPACK]
- ANYTHING SPECIAL: [KIDS, MEDS, FORMAL EVENT, ETC.]

Give me:
1. A complete list grouped by clothes, toiletries, tech, documents, and day-bag
2. An outfit math check so I pack mix-and-match pieces, not extras
3. A "wear-on-the-plane" set to save space
4. Five things people always forget for this kind of trip
5. A quick day-of checklist for the door (passport, charger, keys)

Flag anything weather- or rule-specific. Keep it to one bag if I asked.