The best travel backpacks balance carry comfort with the size your airline permits. A 35 or 40 liter label is not an airline allowance. Compare the packed outer dimensions before deciding which organization system you prefer.
Affiliate disclosure: we may earn a commission through shopping links. This is a research comparison, not a hands-on test. Model generations matter, so match the listing to the specifications before buying.
Best travel backpacks: two different priorities
| Pack | Published dimensions | Reason to consider it | Watch out for |
|---|---|---|---|
| Osprey Farpoint 40, current standard model | 55 x 35 x 23 cm | Framed carrying system and stowable harness | Not a free personal item on most small bag fares |
| Cotopaxi Allpa 35L | 56 x 30 x 25 cm | Suitcase style divided organization | 25 cm published depth exceeds some cabin limits |
Osprey Farpoint 40: start here if carrying matters most
The Osprey Farpoint 40 is the first of these two we would investigate for longer walks with a packed bag. Its current standard model specifications list 55 x 35 x 23 cm and 1.48 kg. The frame and hipbelt are designed to help support a loaded pack.
That specification does not guarantee a comfortable fit on every torso. Try it with the actual weight you expect to carry. Tighten the hipbelt and shoulder straps properly before judging the load.
Owner discussions show why this matters: some prefer the Farpoint’s carrying system, while others dislike its fit or internal layout. The main compartment will not suit everyone who wants many built-in divisions. Packing cubes can help, but they add another purchase and some weight.
The standard model, older generations and Danner collaboration are not interchangeable specification sheets. The saved shopping link may show available variants. Confirm the exact version’s measurements and return policy.
Cotopaxi Allpa 35L: organization first, with a depth caveat
The Cotopaxi Allpa 35L suits travelers who prefer a divided, suitcase style opening. The manufacturer lists 56 x 30 x 25 cm. Its 25 cm depth deserves attention before buying for an airline with a 23 cm limit.
For example, that published depth exceeds Turkish Airlines’ cabin box. A soft bag packed lightly might compress, but we cannot guarantee that at a sizer. Do not treat an owner’s successful trip as a promise for a fully packed new bag.
The internal organization appeals to people who dislike a single large compartment. The tradeoff is accepting that layout even when your load changes. Carry comfort also varies by body shape, so compare it with the Farpoint while both are loaded.
Neither is a universal personal item
These are main cabin backpacks, not automatic substitutes for a small free underseat bag. Compare their dimensions with Ryanair’s free bag or another small bag fare before booking. Capacity in liters cannot settle that question.
If personal item only travel is your goal, use the underseat buying guide to define a smaller target. Buying a larger backpack and hoping to underpack it is a compromise, not guaranteed compliance.
How to choose between the best travel backpacks
Choose your maximum dimensions first, then try the harness with weight. After that, decide whether a large main compartment or built-in divisions better suit your packing. Put ease of carrying ahead of color if you expect stairs, long transfers or uneven streets.
Check the empty pack against your weight budget too. A 1.48 kg pack leaves 5.52 kg for contents under a hypothetical 7 kg total allowance. That calculation can matter more than the difference between 35 and 40 liters.
The best travel backpacks are not always the biggest ones you can carry. A smaller load can improve comfort and reduce sizer uncertainty. Buy only after testing the packed fit while returns are still possible.