Best Carry On Backpack Review - 7 Top Picks

A carry-on backpack can be the difference between gliding out of the airport and wrestling a hard-shell case down a cobbled street. In this best carry on backpack review, we have focused on bags that make sense for real holidays: quick European city breaks, multi-stop adventures and long-haul trips where keeping your essentials close matters.

The right choice is not always the biggest bag. Airline rules, your packing style and how far you expect to walk all matter. A 40-litre backpack is a brilliant one-bag option for a week away, but only if you can lift it comfortably and it fits the airline allowance you have actually booked.

The best carry on backpacks at a glance

1. Osprey Farpoint 40 - Best overall for comfort and versatility

2. Patagonia Black Hole MLC 45L - Best for frequent flyers with work gear

3. Cotopaxi Allpa 35L - Best for organised packers and colourful style

4. CabinZero Classic Pro 42L - Best value large cabin backpack

5. Aer Travel Pack 3 Small - Best polished option for city breaks

6. Peak Design Travel Backpack 45L - Best for photographers and flexible packing

7. Thule Aion 40L - Best for keeping clean and worn items separate

1. Osprey Farpoint 40

The Osprey Farpoint 40 earns its top spot because it feels more like a proper hiking pack than a suitcase with shoulder straps. Its supportive hip belt, adjustable back system and well-padded harness make a noticeable difference when you are changing terminals, climbing station stairs or walking to a hotel after a flight.

The suitcase-style zip makes packing straightforward, while the front pocket keeps travel documents and small essentials within reach. The Farpoint is particularly good for travellers who want one bag for a long weekend in Lisbon and a fortnight moving between destinations.

There is a trade-off. Its outdoorsy look is less sleek than some city-focused backpacks, and it can feel bulky when packed to capacity. Still, if carrying comfort is your priority, this is the one to beat.

2. Patagonia Black Hole MLC 45L

The Patagonia Black Hole MLC 45L is built for travellers who move between airport lounges, coworking spaces and hotels without wanting a separate work bag. It has thoughtful internal organisation, dedicated space for a laptop and enough structure to keep clothes from becoming a crumpled heap.

It can be carried as a backpack, shoulder bag or briefcase-style bag, which is useful when a backpack feels too casual for the setting. The materials are hard-wearing, and the design feels considered without becoming fussy.

At 45 litres, though, this is one to treat with care. It may be accepted as cabin baggage on many airlines when sensibly packed, but it is too large for stricter allowances and far beyond a free personal-item size. Check the bag dimensions against your fare, not just the airline's general cabin limit.

3. Cotopaxi Allpa 35L

The Cotopaxi Allpa 35L is an excellent choice if you love the easy-access feel of a suitcase but prefer the freedom of travelling with a backpack. It opens fully with a clamshell design, and its mesh compartments make it simple to separate outfits, toiletries and cables without relying on a stack of packing cubes.

The 35-litre size hits a sweet spot for five to seven days in warm weather, or a long weekend with a few smarter dinner outfits. It is also a strong option for travellers who tend to overpack, because the capacity gives you a useful limit.

The padded hip belt is not as supportive as Osprey's, so it is better suited to airport-to-hotel days than long treks. Its bold colourways will not suit everyone, but they do make the bag easy to spot in a crowded hostel luggage room.

4. CabinZero Classic Pro 42L

For a spacious, no-nonsense option at a more accessible price, the CabinZero Classic Pro 42L is hard to overlook. It is designed around cabin travel, with a wide front opening, lockable zips and useful padded compartments for a laptop and tablet.

This bag works well for travellers who want to pack plenty but do not need expedition-level back support. The boxier shape uses space efficiently, especially for folded clothes and packing cubes, and the simple exterior avoids the tactical look some travel backpacks lean into.

The compromise is comfort when heavily loaded. The straps are padded, but the harness is not as advanced as premium alternatives. If your journey involves a short walk, taxi or train connection, that may not matter. If you will be carrying it for hours, spend more on a better suspension system.

Best carry on backpack review for airline rules

This is where a great bag can become a poor purchase. Many travel backpacks are marketed as carry-on compatible, but that does not mean they qualify for every ticket type.

For example, budget airlines often separate a free under-seat personal bag from paid cabin baggage. Ryanair's free small bag allowance is much smaller than a 35- or 40-litre travel backpack, while easyJet and British Airways have different policies again. Measurements can also include handles and wheels, and staff may be less forgiving when a flight is full.

Before choosing a bag, compare its stated dimensions with the allowance on the fare you usually buy. If you mostly fly low-cost routes with only a free personal bag, a 20- to 28-litre backpack is the more sensible category. If you routinely add a cabin bag, 35 to 40 litres is often the practical sweet spot.

5. Aer Travel Pack 3 Small

The Aer Travel Pack 3 Small has a smart, pared-back look that suits a long weekend in Copenhagen as well as a work trip to Manchester. Its compact capacity encourages intentional packing, yet it includes excellent organisation for electronics, documents and smaller essentials.

The exterior is understated and durable, the straps are comfortable, and the bag keeps its shape well even when it is not full. This makes it especially appealing if you dislike floppy backpacks that slump around your shoulders.

It is not the best choice for a bulky wardrobe or a beach holiday requiring trainers, sandals and towels. But for three or four nights with a capsule wardrobe, it feels polished, practical and pleasingly manageable.

6. Peak Design Travel Backpack 45L

The Peak Design Travel Backpack 45L is a feature-rich favourite for travellers carrying cameras, lenses or plenty of tech. Its adjustable design can expand or compress depending on the trip, and the internal system works particularly well with compatible camera and packing organisers.

Even without photography gear, there is a lot to like: tidy access points, sturdy construction and a refined appearance. It is a bag for people who enjoy having a place for everything.

That abundance of features brings weight and a higher price. If you only need a simple bag for clothes and a wash bag, it is more backpack than necessary. For creative travellers who want a single carry-on system, it can be a worthwhile investment.

7. Thule Aion 40L

The Thule Aion 40L is a thoughtful pick for active holidays and multi-destination trips. Its standout feature is the separate, wipe-clean compartment for shoes or worn clothing, which is genuinely useful after a rainy hike, a gym session or a sandy beach day.

The main compartment opens wide, the overall design feels smart enough for urban travel, and the recycled materials add a welcome considered touch. It is a particularly good middle ground for couples or solo travellers mixing city sightseeing with outdoor plans.

As with other 40-litre bags, packing discipline matters. Fill every corner and it may become awkward under stricter cabin limits. Use the capacity wisely rather than treating it as permission to bring half your wardrobe.

How to choose the right carry-on backpack

Start with the trip, not the bag. A two-night city break calls for a lighter, smaller pack with quick laptop access, while a two-week rail adventure benefits from a supportive harness and clamshell opening. If you are travelling in winter, remember that jumpers and waterproofs consume space quickly.

Comfort should be tested with weight, not an empty bag. Look for shoulder straps that sit comfortably without rubbing your neck, plus a sternum strap and hip belt if you will walk any real distance. Internal organisation is helpful, but too many fixed pockets can steal valuable space from clothing.

Finally, leave a little room. The best carry-on backpack is one you can close easily on the last morning of your holiday, with space for a souvenir and no need to wear three layers through security. Pick the bag that fits the journeys you actually take, then pack it with enough restraint to make every transfer feel lighter.