What size is a personal item bag?

Most airlines allow a personal item of approximately 40×30×20 cm or 45×35×20 cm. Volume-wise that is 20–30 litres. Budget airlines like Ryanair allow 40×20×25 cm as the free bag — essentially a personal item by other names.

Which bags work best for a personal-item-only week?

The Osprey Daylite (13L) is too small. Aim for 20–26L: Patagonia Black Hole 25L, Eagle Creek Wayfinder 20L, or Db Roamer Bag 25L. The bag must fit under the seat, so avoid frames or rigid structures.

Do I need to do laundry mid-trip to make this work?

Yes. For a 7-day trip in a personal item, plan to sink-wash every 2–3 days or use a hotel laundry service once mid-trip. Without laundry, you need 7 complete outfit sets, which will not fit.

Can I bring a laptop in a personal item for a week trip?

You can, but it costs you roughly 1.5 kg of weight and 4–5 cm of space. For a week's trip where you do not need to work, leaving the laptop at home and using your phone is the most liberating single decision you can make.

Does this work for cold-weather destinations?

Cold destinations are significantly harder. Heavy winter coats, boots, and thermal layers take up most of a personal item alone. The personal-item-only week works best for warm weather or temperature-controlled destinations.

How to Pack a Full Week into a Personal Item Only

A personal item is the underseat bag most airlines allow for free — even on airlines that charge for carry-on bags. It runs about 20–30 litres. Packing a full week into one sounds impossible until you see it done. This guide explains exactly how, with specific gear recommendations and the packing list that makes it work.

The Right Bag

The bag choice is the foundation. Too small and the challenge fails. Too structured and it won't fit under the seat.

Target specs:

Volume: 20–26 litres
Dimensions: fits under most airline seats (approximately 40×30×20 cm or 45×35×20 cm)
No frame, rigid back panel, or external structure that prevents compression
Multiple interior compartments (a single void wastes space)

Recommended bags:

Bag	Volume	Notes
Patagonia Black Hole 25L	25L	Durable, compresses well, waterproof
Eagle Creek Wayfinder 20L	20L	Best organization, RFID pocket
Db Roamer Bag 25L	25L	Premium, laptop sleeve included
Osprey Daylite Plus	20L	Lightweight, good back ventilation
Tropicfeel Shell Backpack	22L	Built-in compression straps

Avoid rolling bags, bags with hard base plates, and anything marketed as a "personal item suitcase" — these often exceed under-seat dimensions on narrow-body aircraft.

The Clothing System

Seven days of clothing in 20–26 litres requires a strict formula. This is not a suggestion — it is a constraint:

The list:

2 t-shirts or light tops
2 base layer tops (merino wool preferred)
1 pair of trousers or pants (worn on travel days)
1 pair of shorts or light trousers
3 pairs of underwear
3 pairs of socks
1 packable layer (ultralight down jacket or packable fleece)

Why this works: You wash every 2–3 days. With 3 pairs of underwear and socks, you wash on day 3 and again on day 6. With 4 tops alternating, 2-day rotations are comfortable. The trousers and shorts cover every situation on a warm-weather or city trip.

What to roll: Roll every item of clothing. Rolled clothing takes 30–40% less volume than folded clothing in a non-structured bag. Use a rubber band around each roll to keep it tight.

Fabric choices matter: Merino wool tops resist odor and can be worn 2–3 times between washes. Synthetic quick-dry fabrics (polyester, nylon) dry in 2–4 hours after sink washing. Cotton is the enemy — it takes 12+ hours to dry and weighs more. If you own cotton t-shirts, leave them home and invest in one merino base layer and one synthetic top before the trip.

Toiletries: Go Solid

The personal item is not exempt from liquids rules. Your entire liquid allowance is 1 litre (8 x 100 ml containers). This is tight when sharing the bag with a week of clothing.

Solid alternatives that save space and weight:

Liquid product	Solid alternative	Saving
Shampoo (100 ml bottle)	Solid shampoo bar	Removes 100 ml slot, lasts longer
Conditioner (100 ml bottle)	Solid conditioner bar	Same
Body wash (100 ml bottle)	Soap bar	Same
Deodorant (roll-on/spray)	Solid deodorant stick	Not a liquid at all

Going solid for shampoo, conditioner, body wash, and deodorant removes four items from your liquids bag and frees four 100 ml slots for items that have no solid alternative (SPF, liquid medication, contact lens solution).

Perfume or cologne: A 10 ml roll-on perfume fits in the corner of any bag. Full-size bottles stay home.

Toothpaste: Travel toothpaste tabs or a 50 ml tube. Not a full tube.

Shoes: One Pair Plus One

Shoes are the space killer in any small bag. The personal-item-only rule is strict:

One pair worn on travel day — wear the most substantial pair you own: trainers, walking shoes, or casual leather shoes
One packable flat pair inside the bag — flip-flops in warm weather, or packable ballet flats, or packable sandals

Vivobarefoot Primus Lite and similar minimal shoes pack to roughly the size of a paperback book and weigh under 200g per shoe. They are not hiking shoes, but for a city or beach trip they cover casual and walking use. Stuff your socks inside them to save additional space.

Do not bring more than two pairs of shoes. There is no scenario on a warm-weather 7-day city or beach trip that requires a third pair.

Electronics: The Decisive Cut

The laptop is the single biggest decision in electronics packing. A 13-inch laptop plus charger weighs approximately 1.5–2 kg and occupies a substantial portion of a 20L bag.

For a 7-day leisure trip: leave the laptop home.

Your phone handles: maps, translation, photos, boarding passes, communication, reading, streaming, light email. It weighs 200g.

Carry instead:

Phone plus cable
Compact USB-C charger (GaN charger, 45–65W, roughly the size of a large sugar cube)
Earphones (wireless earbuds, no cable tangle)
Optional: travel power bank if you need camera or heavy navigation use

If you genuinely need a laptop for work travel, this guide is not the right constraint for you — you need a carry-on, not a personal item.

Laundry: The System Behind the System

The personal-item week does not work without laundry. Here is how to make it effortless:

Sink wash method:

Fill the sink with warm water
Add a small amount of travel laundry soap (Scrubba Wash Bag soap bar, Travelon, or similar)
Wash items by hand — 2–3 minutes per item
Rinse until water runs clear
Wring firmly, roll in a dry towel to remove excess water
Hang overnight — most items dry in 4–8 hours

Scrubba Wash Bag: A small dry bag with an internal washboard. Weighs 140g, costs under £30, and reduces wash time to 3 minutes per session. It packs flat.

Travel laundry strips: Dissolving soap sheets that take zero space. Brands include Tru Earth and Eco Roots. Alternative to liquid soap for the liquids bag.

Hotel laundry service: Available in virtually every accommodation. Not free, but on a 7-day trip, one laundry service mid-week is realistic and removes the sink-wash effort entirely.

What This Works For — and What It Doesn't

Ideal use cases:

Weekend to 7-day warm-weather beach trips
City breaks in moderate climates
Destinations with laundry access (hotels, Airbnbs with washing machines)
Trips where you move between locations and want minimal weight

Does not work well for:

Business trips requiring multiple formal outfits
Winter travel with heavy coats and boots
Destinations without laundry access
Trips involving hiking or technical outdoor gear

The personal-item week is a discipline as much as a packing challenge. The payoff is flying on airlines that charge for carry-on bags — Spirit, Ryanair, Frontier — for free, while everyone else pays €25–€40 per leg.