Seven days is a laundry plan wearing a backpack. Published 35 L to 40 L bags cover the week if you wash once.
A week is a laundry problem wearing a backpack. Either you wash mid-trip or you bring a cube you will resent. The best week-long bag is the published 35 L to 40 L pack that matches how you move, plus one Isolate cube for the day you wash. Who is traveling still decides the opening. The nights decide whether you wash.
We pack from the week-long field note. That list is built from laundry cadence and carry-on volume. Gear links only to existing gear picks. The extra 45 L pack is the next step only if a coat forces it, not because seven is a large number.
The week-long list is the laundry plan
The field note fits seven days into one bag:
- Bag: 35 L to 45 L if you are one-bagging. Start at carry-on backpacks.
- Cubes: one clothes cube, one dirty or Isolate cube. See packing cubes.
- Clothes: 4 to 5 shirts, 2 trousers or skirts, 7 underwear, 5 to 6 socks, one knit, one shell.
- Shoes: wear the heavy pair. Pack the light pair only if the trip needs it.
- Toiletries: a full 100 ml kit. Do not discover liquids rules at the tray.
- Power: adapter and bank from travel adapters.
- Water: empty bottle through security.
Swap fabrics for climate. Hot and humid trips add Isolate for damp clothes. Cold trips add volume for the knit and the shell. The shirt count stays in that 4 to 5 range if you wash once.
A solo backpacker on a carry-on flight washes a sink of shirts on night four. Retirees on a cruise can use the ship laundry or the same sink plan in a cabin with a wrap-zip bag. A business traveler on rail washes if the week is shirts for rooms, or packs the fifth shirt and skips the sink if every day is a meeting.
35 L to 40 L is the published week
The Cotopaxi Allpa 35L is the suitcase-style week bag. Cotopaxi publishes 35 L (2,135 in³), 22 x 12 x 10 in (56 x 30 x 25 cm), and about 2 lb 15 oz / 1.33 kg on the redesigned recycled-fabric edition. Mesh clothing compartments and a full wrap zip are the drawer system. On a cruise bunk or a hotel dresser, that opening is the reason to pick Allpa over a top-loader.
The Aer Travel Pack 4 35L is the lay-flat week bag. Aer publishes 35 L, 3.90 lb for the ballistic nylon 35 L, and 21.5 x 13.5 x 9 in (54.5 x 34 x 23 cm). The official page lists a $259 list for that ballistic nylon SKU. A suspended 16 in laptop sleeve is the work argument. Use Aer when the week includes a computer. Use Allpa when the week is clothes you want to see as drawers.
If a shell and a knit will not fit 35 L, the Osprey Farpoint 40 publishes 40 L, 22 x 14 x 9 in, and 3.486 lb / 1.581 kg. The Osprey Fairview 40 is the women’s-fit sibling with the same 40 L travel brief. Those two bags are the walking week. The hipbelt stows when you check them. The frame earns its place when you walk between stations.
Do not step to a 45 L pack because the week “feels long.” The week-long field note already sets 35 L to 45 L as the one-bag window. Start at 35 L. Use 40 L when layers force it. Use 45 L when the trip is a lodge or a hatch, not a cabin aisle.
Isolate is the wash bag
Eagle Creek Pack-It Isolate is the dirty-clothes cube. Eagle Creek publishes Isolate to keep dirty or wet kit away from clean clothes. On laundry day, the worn shirts go in Isolate. The clean stack stays in the other cube. After the sink or the machine, Isolate becomes the damp cube until the shirts dry.
One Isolate cube is enough. A second Isolate cube is how the week grows a second bag.
Liquids for seven days
The TSA 3-1-1 liquids rule still caps carry-on containers at 3.4 oz (100 ml) or less, in one quart-sized bag. A week does not change the tray. It changes whether you refill travel bottles at the destination or pack solids in capsules. The travel bottles field note is the hub. Confirm the 100 ml size on the tube you buy.
Name the traveler, then the nights
Open the Trip Planner and pick who is going and how they move. On the journey page, choose week. The walk already maps Allpa 35, Aer 35, or Farpoint 40 to that traveler. This note is the laundry chapter. The journey is the bag, the sleep kit, the tech, and the list in order.
Four shirts and a wash beat seven shirts and a bag you hate to lift. That is the week.
