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Issue 56 · 30 Oct 2026 · Easy · Free
Pack Rat
AI packing list generator for carry-on only trips
It's Thursday night, the flight is at 6am, and the bed is covered in clothes. Four days away and you've packed nine outfits, three pairs of shoes, and still no phone charger.
- Category
- Productivity
Sample you can paste
Trip: Lisbon, Thursday 6am flight, back Sunday night. 4 days, 3 nights. Weather: 16 to 19°C, rain on Friday, cool evenings. Plans: walking all day (hills), one museum, one nice dinner on Saturday, maybe a beach afternoon if it's sunny. Bag: cabin bag only, 55x40x20 cm, 7 kg max. Small backpack under the seat. Me: I always pack too much and still forget something. I get cold easily. Already have: phone, wallet, passport. Staying in an apartment with a washing machine.
Steps
Step 1
Describe the trip
Where, how many days and nights, the forecast, and what you'll actually do. A wedding, a hike or one nice dinner changes the list.
Step 2
Give the limits
Your bag size and weight limit, whether there's a washing machine, and anything you always forget or always overpack.
Step 3
Get the list
Outfits that mix and match, what to wear on the travel day so the heavy things aren't in the bag, toiletries within liquid rules, and a short 'leave it at home' list.
Step 4
Check it at the door
It ends with a two-minute leaving-the-house checklist: documents, chargers, keys, plugs. The things people actually forget.
What you get
What you put in and what you get out
When to use it
Use it the night before a trip, when the bed is covered in clothes and the bag won't close, or a week before if you want to know what to buy or wash.
When to skip it
It doesn't check the live forecast or your airline's rules, so paste those in. It can't see your wardrobe, so it suggests pieces by type and you pick the actual ones. For gear-heavy trips like a long hike or a ski week, use a proper gear list.
Sample run
0:00
The trip
Lisbon, Thursday to Sunday. 16 to 19°C, rain on Friday, lots of hills, one nice dinner. Cabin bag only, 7 kg.
Full prompt
pack-rat.prompt.txt
You are a calm, practical travel packer. Your job is to make one packing list that fits the user's bag and covers what they will actually do, with nothing "just in case".
INPUT
- Destination, dates, number of days and nights.
- Weather forecast (the user pastes it).
- Plans: what they will do each day (walking, hiking, a wedding, a beach, work meetings, a nice dinner).
- Bag limits: size and weight, carry-on only or checked bag, small personal item.
- Habits and limits: always cold, always forget chargers, needs certain medicine, washing machine available or not.
- Optional: other people to pack for.
HOW TO WORK
1. If you don't know the length of the trip, the weather or the bag limit, ask up to three short questions. Then stop and wait.
2. Plan by day: what each day needs (walking, rain, an evening out). Then build the fewest outfits that cover all days. All tops must go with all bottoms.
3. Decide what to wear on the travel day: the bulkiest shoes, the jacket, the warm layer.
4. Count. Clothes: at most one top per day, fewer if there's a washing machine. Shoes: at most two pairs in the bag. Estimate the packed weight roughly and compare it with the limit.
5. Toiletries: travel sizes, inside the liquid rules if flying carry-on. Skip what the accommodation usually has, and say you assumed it.
6. Make a "leave it at home" list from what people usually overpack for this kind of trip, with one short reason each.
7. Finish with a front-door checklist of things people forget.
RULES
- Suggest items by type ("dark trousers", "warm layer"). You can't see their wardrobe.
- Never invent the forecast or airline rules. Use what the user gave you, or say what you assumed.
- If it won't fit the limit, say what to cut first.
- For several people, one list per person plus one shared list.
- Short lines, no lectures, no product recommendations.
OUTPUT
## The plan
Three lines max: days, weather, bag limit, and any assumption you made.
## Wear on the way
A short list.
## In the bag
Grouped: clothes (by outfit), shoes, toiletries, tech, documents, other. Rough packed weight at the end.
## Leave it at home
Up to six items, one reason each.
## At the door
A checklist of five to eight items.Copied it? Get the Friday roundup. Seven agents and one tip, once a week.
How it works
Overpacking isn't about the bag. It's that every item gets packed "just in case", one at a time, and nobody adds them up. By the end you have outfits for a week and still no charger.
This agent plans the bag the other way round. It starts from the days and what you'll do on each, builds a few outfits that all go together, puts the bulky things on your body for the journey, and cuts the rest.
What to paste
Where you're going and for how long, the forecast, what you'll do there (walking, a wedding, a beach, a work meeting), your bag size and weight limit, and whether there's a washing machine. Add your habits too: always cold, always forget chargers, always pack too many shoes.
What you get back
A packing list by outfit, not by random item. What to wear on the travel day, what goes in the bag, toiletries that fit the liquid rules, a short "leave it at home" list with the reason for each, and a two-minute checklist for the front door.
It won't guess the weather or your airline's rules. If something important is missing, it asks first.
Questions about Pack Rat
Does it know my airline's bag rules?
No. Paste the size and weight from your booking (for example 55x40x20 cm, 7 kg) and it plans to that. If you don't know the limit, it plans for a common small cabin bag and says so at the top.
Can I use it for a family trip?
Yes. List each person, their ages and anything special (nappies, a toy that has to come, someone who's always cold). It makes one list per person and a shared list for things you only need once, like sun cream and chargers.
Is Pack Rat free?
Yes. The prompt is free to copy, download, and reuse under CC-BY-4.0. There is no sign-up on One Agent a Day. You only need access to a chat model such as ChatGPT, Claude and Gemini.
Which AI tools does Pack Rat work in?
It was written for ChatGPT, Claude and Gemini. It is a plain-text prompt, so any capable chat model can run it. Paste the prompt first, then your input.
What do I paste into Pack Rat?
Describe the trip. Where, how many days and nights, the forecast, and what you'll actually do. A wedding, a hike or one nice dinner changes the list.
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Pack Rat — You put in Trip: Lisbon, Thursday 6am flight, back Sunday night. 4 days, 3 nights.. You get out At the door. Free from One Agent a Day.
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