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Our top picks
Short on time? Our top recommendation is the Osprey Farpoint 40.
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At a glance
The traits that separate these picks, side by side.
| # | Product | Best for | Key feature | |
|---|
| 1 | | — | 40L across S/M and M/L harness sizing | Check ↗ |
| 2 | | — | 42L suitcase-style full-wrap zipper opening | Check ↗ |
| 3 | | — | 35L suitcase-style opening, carry-on sized | Check ↗ |
| 4 | | — | Expands from 35L to 45L via external compression straps | Check ↗ |
In depth
The 4 best, explained
Why each made the cut, where it falls short, and who should buy it.
Top pickOsprey
Its case rests on clears nearly every carrier's carry-on sizer at 40L and stowable harness means nothing snags on jet bridges or overhead bins. One caveat, fixed ma in compartment, no expansion for a longer trip.
- 40L across S/M and M/L harness sizing
- Removable 11L Daylite Plus daypack
- LightWire frame suspension, stows away for flights
- Zip-away hipbelt and harness
- Lockable dual-zip ma in compartment
✓ Pros
- Clears nearly every carrier's carry-on sizer at 40L
- Stowable harness means nothing snags on jet bridges or overhead bins
- Removable daypack functions as a real day bag, not just a stuff sack
✕ Cons
- Fixed ma in compartment, no expansion for a longer trip
- S/M and M/L sizing means checking your torso length before buying
- Daypack attaches externally and adds bulk when both pieces are worn together
Cotopaxi
42L is the most volume in this list while still reading as a standard carry-on
- 42L suitcase-style full-wrap zipper opening
- 1000D TPU-coated polyester shell, 840D ballistic nylon panels
- Removable hip belt, air-mesh shoulder straps
- 15-inch laptop sleeve and 12.5-inch tablet sleeve
- Exterior stretch water bottle pocket, luggage pass-through strap
✓ Pros
- 42L is the most volume in this list while still reading as a standard carry-on
- Suitcase-style opening lays flat for fast packing and security checks
- Colorful, distinct designs make the bag easy to spot on a belt or overhead bin
✕ Cons
- 42L pushes past some tighter international carry-on sizers
- Heavier empty weight than the Farpoint 40 due to the burly shell fabric
- Fewer organizational pockets than purpose-built travel packs at this price
Cotopaxi
And same suitcase-style layout as the 42L version in a smaller footprint. One caveat, less room than the 40L and 42L packs in this list for longer trips.
- 35L suitcase-style opening, carry-on sized
- 1000D TPU-coated polyester, 100% recycled fabrics
- Air-mesh back panel and removable hip belt
- Exterior stretch water bottle pocket
- Luggage pass-through strap
✓ Pros
- 35L clears most European budget-carrier cab in limits with room to spare
- Same suitcase-style layout as the 42L version in a smaller footprint
- Recycled fabric build backed by a lifetime warranty
✕ Cons
- Less room than the 40L and 42L packs in this list for longer trips
- Hip belt is thinner than a dedicated hiking-style harness
- Fewer external quick-access pockets than the Peak Design pack
Peak Design
Its case rests on compresses to a smaller, stricter-sizer-friendly footprint when needed and three separate access points make it easy to grab items without unpacking.
- Expands from 35L to 45L via external compression straps
- Weatherproof 400D recycled nylon canvas shell
- Rear, top, and side access with MagLatch closures
- Tuck-away hip belt and sternum strap
- Compatible with Peak Design packing cubes and camera cubes
✓ Pros
- Compresses to a smaller, stricter-sizer-friendly footprint when needed
- Three separate access points make it easy to grab items without unpacking
- Weatherproof shell holds up in ra in at bus stops and gate walks
✕ Cons
- Tuck-away straps take a bit of practice to stow cleanly
- Heavier than the Osprey Farpoint 40 when fully packed
How we chose these picks
Every pick below earned its place through documented strengths, verified specifications, consistent praise in reputable reviews, and owner-feedback patterns. We don't sell placements, and we don't invent test scores.
Mistakes buyers often make
- Buying on brand name alone instead of matching features to your actual use case.
- Overpaying for headline specs you'll never use, define must-haves first.
- Ignoring size — compatibility, and ongoing costs (filters, accessories, refills).
- Trusting star ratings without reading what owners compla in about after 6 months.
How to choose: the factors that matter
- Capacity and sizing — Measure your space and your actual use before falling for bigger-is-better. The right size is the one that fits your routine, not the spec sheet's maximum.
- Build quality and materials — Heavier-gauge materials, tight tolerances, and solid joints outlast thin, rattly construction. In reviews, look for longevity comments over first-impression praise.
- Ease of use and setup — Clear instructions, intuitive controls, and minimal assembly separate daily drivers from garage ornaments.
- Maintenance and cleaning — Whatever you buy will need cleaning. Removable, dishwasher-safe, or wipe-clean parts get maintained; fiddly ones get neglected.
- Warranty and support — A multi-year warranty signals the manufacturer expects it to last. Check what's actually covered, motors and frames matter more than accessories.
The bottom line
There's no single 'best' here, only the best match for your situation. Start from your must-have features, then choose the least expensive pick that covers them.
FAQ
Common questions
What are the best travel backpacks for Carry-On only travel right now?
Our top pick is the Osprey Farpoint 40 (top pick), because clears nearly every carrier's carry-on sizer at 40L. The runner-up is the Cotopaxi Allpa 42L Travel Pack, followed by the Cotopaxi Allpa 35L Travel Pack.
Is the Osprey Farpoint 40 worth it?
For most buyers, yes. It ranks #1 in our travel backpacks for Carry-On only travel research, though fixed ma in compartment, no expansion for a longer trip.
What size backpack counts as a carry-on?
Most US carriers allow a carry-on up to roughly 22 x 14 x 9 inches, and most international carriers are stricter, often closer to 21.5 x 13.5 x 7.5 inches or a 40-liter volume cap. A 35 to 40-liter backpack that measures under 22 x 14 x 9 inches clears nearly every US carrier. For airlines with tighter international limits (Ryanair, easyJet, and similar budget carriers), check the exact bag before flying, since several 40 to 45-liter packs technically exceed those smaller sizers even though they pass on US domestic carriers.
Is 40 liters too big for a carry-on?
Not for US domestic carriers, w here 40 liters is a standard carry-on size and packs like the Osprey Farpoint 40 are built specifically to that limit. For budget European carriers with an 8 to 10-kilogram or 40 x 20 x 25-centimeter personal item limit, a 40-liter pack can be too large and may need to be gate-checked or paid for as a larger cab in bag. Confirm the airline's specific limit before a trip that includes a budget carrier leg.
Do expandable backpacks like the Peak Design 45L still fit as carry-on?
At their compressed, smaller size, yes. The Peak Design Travel Backpack 45L compresses down to roughly a 35-liter footprint for stricter carry-on sizers and expands to 45 liters when checked or for a more forgiving airline. The expansion happens via external straps rather than changing the bag's core dimensions, so the compressed size is what matters for gate sizers.
What's the difference between a suitcase-style and top-loading travel backpack?
A suitcase-style pack (Cotopaxi Allpa, Peak Design Travel Backpack) opens flat on a full-wrap zipper like a piece of luggage, so contents are visible and accessible without unpacking from the top. A top-loading pack (traditional hiking-style backpacks) loads from a single opening at the top, which is faster to close but makes it harder to reach items packed at the bottom. Most dedicated travel backpacks released in the last several years use the suitcase-style opening because it is easier to pack and search at security.
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