Best travel backpack

The three tiers

How do they compare?

How we chose

Every figure here came from the product listing itself: the dimensions a manufacturer states on Amazon, not a bag we opened and measured. None of these packs were tested in person, and backpack listings almost never say whether the stated size includes external straps, so treat every "as listed" figure as a starting point, not a guarantee that a specific sizer at a specific gate will pass it.

We picked bags that clustered around the two numbers that actually decide whether a travel backpack works: the 40 to 45 liter range most one-bag travel guides recommend, and the two competing size ceilings, 55 x 40 x 20 cm (the metric standard several European carriers use for a paid or included overhead bag) and 22 x 14 x 9 inches (the size most named on US full-service and low-cost carriers' own carry-on pages). A bag that clears one does not automatically clear the other.

Buying tips

Does a 40L backpack actually fit the 22 x 14 x 9 inch carry-on standard?

Not automatically. Liters measure volume, not the three linear dimensions an airline's sizer checks, so two 40L packs can differ by several inches in any direction depending on how the brand shapes the bag. Check the listed length, width and depth against your airline's published carry-on page before you buy, and remember that a soft-sided backpack can be squeezed to fit a sizer even when its relaxed, fully packed shape would not.

Why do some listings quote centimeters instead of inches?

Brands that sell heavily into the European and UK market size their bags against the metric figure carriers there publish, most often 55 x 40 x 20 cm for a paid overhead allowance. That figure converts to roughly 21.7 x 15.7 x 7.9 inches, which is deeper in width but shallower in depth than the American 22 x 14 x 9 inch standard. A bag built for one is not automatically sized for the other; check both if your trip crosses the Atlantic.

Front-loading or top-loading, does it matter for a flight?

It does not affect whether the bag fits a sizer, but it affects how fast you can get through security and repack after a gate check. A front panel that unzips flat like a suitcase lets you find your laptop, liquids bag and a change of clothes without unpacking the whole thing; a traditional top-loading pack means digging from one opening. If you travel often enough that time at security or on a layover matters, favor the front-loading style.

Is a laptop compartment worth paying more for?

If you fly with a laptop on most trips, yes: a dedicated padded sleeve near your back protects the laptop and speeds up TSA screening in checkpoints that still ask you to remove electronics. If you rarely travel with a laptop, that compartment is dead space you carry empty, and a simpler bag without it usually costs less for the same liter capacity.

When does it make sense to size up past 45L?

Size up only if you plan to check the bag or accept that it may get gate-checked on a full flight. Past roughly 45L, packs start exceeding both the metric and imperial size standards most airlines publish, and no amount of squeezing a rigid-frame bag makes it smaller. A 55L or larger pack buys backpacking-trip capacity at the cost of guaranteed overhead bin space.