How do I choose the best travel backpack for a long trip?

For a long trip, I’d choose the backpack based on how you’ll travel rather than the number of days alone. A good one-bag setup can work for weeks if you’re willing to do laundry.

1. Start with the airline, not the backpack

Check the exact carry-on dimensions and weight limit for every airline on your itinerary. Airlines care about external dimensions, not the backpack’s advertised liters. A common U.S. carry-on limit is around 22 × 14 × 9 in, but international and budget airlines can be considerably stricter.Pack & Porter+1

As a rough guide:

• 25–30L: minimalist travel, weekends, or personal-item use
• 30–35L: excellent for light one-bag travel
• 35–40L: generally the sweet spot for long trips while remaining carry-on oriented
• 40–45L: useful for bulkier clothing/gear, but increasing the risk of exceeding airline limits
• 45L+: generally better treated as checked luggage

The important point: a 35L bag with the right dimensions can be more airline-friendly than a 30L bag with an awkward shape.Pack & Porter

2. Prioritize carrying comfort

If you're going to walk through airports, train stations and cities with the pack, comfort matters enormously.

Look for:

• A proper hip belt that transfers weight from your shoulders to your hips
• Padded, adjustable shoulder straps
• A sternum strap
• A supportive back panel or frame
• A torso length that actually fits you
• Padding that doesn't become uncomfortable after 20–30 minutes

Your torso length matters more than your overall height when fitting a backpack.Thewearify

3. Get a clamshell opening

For travel, I'd generally favor a backpack that opens like a suitcase rather than a traditional hiking-style top loader.

A clamshell lets you:

• Pack with cubes
• See almost everything immediately
• Access things at the bottom without unpacking the whole bag
• Keep clothes organized in hotel/hostel rooms

That's particularly useful when you're changing locations frequently.WeRoad+1

4. Don't overdo the organization

Lots of pockets look appealing, but every built-in compartment consumes space and adds weight.

I'd prioritize:

1. Large main compartment
2. Easy-access small-items pocket
3. Laptop/tablet compartment if needed
4. Water-bottle access
5. A few compression straps
6. Lockable or security-conscious zippers

Then use packing cubes for the rest.

5. Pay attention to empty weight

A 40L backpack that weighs 4.5 lb gives you substantially less useful luggage allowance than one weighing 2.5–3 lb.

This becomes particularly important on airlines with strict cabin-weight limits.

6. Consider what "long trip" actually means

A six-month trip doesn't necessarily require a huge backpack. If you're traveling through cities and can do laundry, 35–40L can be enough for an indefinitely long trip.

If you're carrying things like:

• Hiking equipment
• Heavy camera gear
• Cold-weather clothing
• Multiple pairs of shoes
• Camping equipment

then a larger or specialized pack may make more sense—but you may have to accept checked luggage.

A few current examples worth looking at

• Osprey Farpoint 40L Travel Pack - $199.95 (Backcountry)
• Cotopaxi Allpa 35L Travel Pack - $230.00 (Cotopaxi)
• Osprey Transporter 36L Travel Pack - $224.95 (Backcountry)
• Peak Design Travel 45L Backpack - $299.95 (Backcountry)

The Osprey Farpoint 40 is a good example of a pack emphasizing carrying comfort and travel-oriented design; the Cotopaxi Allpa 35L is more compact and organization-focused. The Peak Design 45L is an example of the tradeoff at the larger end: substantially more capacity, but you need to pay close attention to its actual dimensions and the airline you're flying.Pack & Porter

My practical formula: for a long trip involving lots of flights, trains, buses and walking, start by looking at 35–40L clamshell backpacks, then eliminate anything that doesn't fit your airline's dimensions, doesn't fit your torso comfortably, or weighs more than you're willing to carry.

If you tell me trip length, destinations/climate, whether you'll fly carry-on only, your budget, and whether you need a laptop, I can narrow it down to a few specific backpacks.

For a long trip, choose the backpack around how you’ll actually travel—not simply the biggest capacity you can find.

1. Start with the size

If you want to travel carry-on only, 35–40L is a useful range for many travelers. Current guides commonly put 35L around the comfortable carry-on zone, while 40L is near the upper end.Passage & Pier+1

• 30–35L: minimalist packing, frequent laundry, lighter walking
• 35–40L: good balance for roughly 1–2 weeks, and potentially much longer with laundry
• 40–45L: more room, but greater risk of exceeding airline dimensions
• 50L+: consider this mainly if you're checking the bag or carrying bulky/specialized equipment

Important: airlines care about external dimensions, not the advertised liters. A "40L carry-on" isn't automatically acceptable.Pack & Porter

2. Prioritize the harness and fit

For a long trip, comfort matters more than having an extra few liters.

Look for:

• A padded, supportive hip belt
• Adjustable shoulder straps
• Sternum strap
• Some kind of internal frame/support
• A back length appropriate for your torso

Torso length—not your overall height—is particularly important for getting the hip belt positioned correctly.Pack & Porter

If you'll routinely walk 30+ minutes with the bag loaded, I'd put substantially more emphasis on the suspension system than on pockets or aesthetics.

3. Get a suitcase-style opening

A clamshell/180° opening is extremely useful for long trips because you can lay the bag open and see your clothes rather than digging down from the top.The Tools Trunk

I'd generally look for:

• Large main compartment
• Compression straps
• Separate laptop compartment if needed
• A few genuinely useful exterior pockets
• Lockable or robust zippers
• A water-bottle pocket

Don't go overboard on organization, though. Lots of tiny pockets can consume space and add weight.

4. Keep the empty weight reasonable

A 40L backpack that weighs 4–5 lb empty leaves you carrying a surprising amount of bag before you've packed anything.

For long trips, I'd generally target around 2.5–3.5 lb empty unless the heavier bag's suspension or features provide a meaningful benefit.

5. Think about your actual itinerary

Your trip makes a big difference:

For a long urban/travel trip, I'd rather have a comfortable 35L bag and do laundry than carry a huge 60L pack everywhere.

6. A few current examples

If you're shopping now, these illustrate different approaches:

• Osprey Farpoint 40L - $199.95 (Backcountry)

• Cotopaxi Allpa 35L - $230.00 (Nordstrom)

• Aer Travel Pack 4 35L - $259.00 (Aer)

• Thule Aion 40L - $209.95 (Abt Electronics, Inc.)

• Osprey Farpoint 40: particularly oriented toward carrying comfort, with a supportive harness and 40L capacity. Current published specs put it around 3.1–3.3 lb depending on version/source.Passage & Pier+1

• Cotopaxi Allpa 35L: a smaller, highly organized option if you want to stay relatively compact.

My simple buying formula

For most long trips, I'd narrow the search to:

35–40L + clamshell opening + good hip belt + appropriate torso fit + under ~3.5 lb empty + dimensions that match your strictest airline.

Then load it with about 15–20 lb of your actual gear and walk around with it before committing. That's a much better test than judging it empty in a store.

If you tell me your trip length, destinations/climate, whether you'll fly carry-on only, your budget, and whether you'll carry a laptop/camera, I can narrow this down to a few specific backpacks and compare them.

For a long trip, the best travel backpack is usually the smallest bag that comfortably holds everything you actually need. A bigger bag tends to encourage overpacking.REI

1. Choose the capacity first

A useful rule of thumb:

• 30–35 L: Best for minimalist one-bag travel and carry-on use.
• 35–40 L: The sweet spot for many travelers doing 1–2+ weeks with laundry along the way.
• 40–55 L: Better if you're traveling for a long time, carrying bulkier clothing, or don't mind checking the bag. REI specifically recommends 40–55 L for extended trips.REI
• 60+ L: Usually unnecessary for ordinary city/international travel unless you're carrying specialized equipment.

If you want to avoid checked baggage, don't choose based on liters alone—check your airline's actual dimensions and weight limits. Airlines differ, and even a nominally "carry-on" 40–45 L bag can exceed a particular carrier's limits.REI

2. Prioritize fit over clever features

This is probably the most important factor.

Look for:

• A hip belt that actually transfers weight from your shoulders to your hips.
• Adjustable torso length, if possible.
• Comfortable, padded shoulder straps.
• A sternum strap.
• Load-lifter straps for keeping the pack close to your body.

Your torso length—not your height—is the key measurement for backpack fit.REI

When trying it on, put roughly 10–15 lb (4.5–7 kg) inside and walk around. A backpack that feels great empty can feel terrible after several hours loaded.REI

3. Decide how you want to pack

For travel, I'd strongly favor a clamshell/suitcase-style opening over a traditional top-loading hiking pack. It lets you see nearly everything without digging through the entire bag.

Useful features include:

• Full-zip/clamshell main compartment
• Internal compression straps
• Separate laptop compartment if needed
• Easily accessible passport/phone pocket
• Water-bottle pocket
• Lockable zippers
• Stowable shoulder straps if you'll check the bag
• Some weather resistance

Don't go crazy with pockets, though. Extra organization adds weight and can make a bag more complicated than necessary.REI

4. Match the backpack to your trip

Mostly cities, trains and airplanes: Choose a 35–40 L travel pack with good organization and carry-on dimensions.

Lots of hiking: Consider a genuine hiking pack rather than a suitcase-style travel backpack. Ventilation, suspension and load carrying become much more important.REI

Laptop + camera + electronics: Look for dedicated, well-padded tech storage—but remember that padding can make a pack considerably heavier.

Hot/humid destinations: Prioritize a ventilated back panel and breathable shoulder straps.

Frequent rain: Water-resistant fabric and/or a rain cover are worthwhile, especially if you're walking between destinations.

5. A few current options worth considering

• Osprey Farpoint 40L - $199.95 (Backcountry)
• Cotopaxi Allpa 35L - $230.00 (Nordstrom)
• Peak Design Travel 45L - $299.95 (Backcountry)
• Thule Aion 40L - $209.95 (Abt Electronics, Inc.)
• Osprey Daylite Carry-On 35L - $129.95 (Backcountry)

These illustrate different approaches: the Osprey Farpoint 40L emphasizes comfortable load carrying, the Cotopaxi Allpa 35L emphasizes organized carry-on travel, and the Peak Design 45L gives you more capacity and tech-oriented features. REI's current 2026 travel-pack guide also highlights the Allpa 35L, Osprey Farpoint/Fairview, Peak Design Travel Pack 45L and others.REI

My rule of thumb

If I were choosing a single backpack for a long international trip, I'd start with a 35–40 L clamshell pack, aim to keep the loaded weight around 15–20 lb (7–9 kg), and make fit and comfort more important than pockets, aesthetics or maximum capacity.

If you tell me your trip length, destinations/climate, whether you want carry-on only, and budget, I can narrow it down to 3–5 specific backpacks.

Choosing the best travel backpack for a long trip comes down to how you travel, what you carry, and how often you’ll be wearing it. A great bag should feel comfortable after hours of walking, keep your gear organized, and fit your airline’s size rules.GearLab+1

1. Pick the right size

For most long trips, a 35–45 liter backpack is the sweet spot:

• 30–35L: Best for minimalist travelers, warm climates, frequent laundry, and shorter trips.
• 35–40L: The best balance for many one-bag travelers.
• 40–45L: Better if you need extra clothing, cold-weather gear, camera equipment, or work gear.
• 50L+: Usually starts becoming bulky and may be harder to carry on flights.CleverHiker

Remember: airlines care about external dimensions, not just the advertised liters. Check your airline’s carry-on limits before buying.Taketravelinfo.com

2. Prioritize comfort over pockets

A backpack that looks great online can become painful when loaded. Look for:

• Padded shoulder straps
• A supportive hip belt (especially above ~35L)
• Adjustable torso length if possible
• Ventilated back panel
• Weight sitting close to your body

Try it loaded with 20–30 pounds if you can. A comfortable 40L bag beats an uncomfortable 55L bag.

3. Choose a travel-friendly opening style

For long trips, a clamshell/panel-loading design (opens like a suitcase) is usually easier than a hiking-style top loader:

• Easier to pack and unpack
• Lets you see everything
• Works well with packing cubes
• Better for living out of a bag for weeks

Many popular travel packs use this style, including the Cotopaxi Allpa and Peak Design Travel Backpack lines.GearLab

4. Match the backpack to your travel style

For city hopping, hostels, and trains

Look for:

• 35–40L size
• Easy organization
• Lockable zippers
• Laptop sleeve if needed

Good examples:

• Cotopaxi Allpa 35L Travel Pack — strong organization and suitcase-style packing.GearLab
• Osprey Farpoint 40 Travel Pack — known for a more backpacking-style comfortable carry system while remaining travel-focused.Pack Hacker

For digital nomads

Prioritize:

• Padded laptop compartment
• Tech organization
• Durable materials
• Easy access

A larger option such as the Peak Design Travel Backpack 45L is designed around flexible access and tech/camera-friendly organization.

For hiking + travel combined

Choose:

• Better suspension
• More breathable back panel
• Real hip belt
• Weather resistance

A pure travel backpack may not be as comfortable on trails.

5. Don’t overpay for features you won’t use

Useful features:

• ✔ Lockable zippers
• ✔ Water-resistant fabric
• ✔ Separate dirty laundry/shoe compartment
• ✔ Laptop protection
• ✔ Hidden passport pocket
• ✔ Stowable straps (for flights)

Less important:

• Too many tiny pockets
• Heavy built-in organizers
• Excess padding that reduces usable space

6. Think about your packing habits

Ask yourself:

• Do I pack light and do laundry? → 35–40L
• Do I bring multiple shoes? → 40–45L
• Do I carry camera gear? → larger or specialized pack
• Do I move every few days? → prioritize comfort
• Do I stay in one place for weeks? → more capacity may help

A simple buying checklist

Before purchasing, check:

• Fits your airline’s carry-on dimensions
• Comfortable when fully loaded
• Opens like a suitcase
• Has a real hip belt (if large)
• Durable zippers and fabric
• Fits your laptop/tech needs
• Not heavier than necessary

For many travelers taking a months-long trip, I’d start by comparing a 35–40L clamshell bag and only go larger if your packing list proves you need it.Passage & Pier

If you tell me your trip length, destinations/climate, budget, and whether you’ll carry a laptop or camera, I can narrow it down to a few specific backpacks.

For a long trip, I’d choose a backpack based less on the number of days and more on how you travel, how much you carry, and whether you want to fly carry-on only.

1. Pick the capacity first

A useful starting point:

• 30–35L: Minimalist travel, roughly a week or more if you do laundry.
• 35–45L: Best all-around range for one-bag travel and longer trips.
• 45–55L: More comfortable for extended trips, colder climates, or bulkier gear, but increasingly likely to require checking.
• 60L+: Usually better for camping/technical gear or trips where you'll check luggage.

Current travel-backpack guides generally favor 30–45L for carry-on travel, while 40–55L is more appropriate when you need additional capacity.Pack Hacker+1

My default recommendation: 35–40L. It's large enough for a serious trip without encouraging you to pack your entire house.

2. Check the dimensions—not just liters

A bag advertised as "40L" isn't automatically carry-on compliant. Airlines care about the backpack's external dimensions, and those limits vary.

For example, a common U.S. carry-on benchmark is around 22 × 14 × 9 inches, but you should check the airlines you'll actually use.REI

Also consider what happens when the bag is stuffed full. A bag that technically fits when empty may become too deep once expanded.

3. Prioritize the fit

This is arguably more important than capacity.

Look for:

• Adjustable shoulder straps
• A sternum strap
• A substantial hip belt, especially for heavier loads
• A supportive back panel
• Appropriate torso length
• Padding that doesn't create pressure points

Your torso length matters more than your overall height when determining backpack fit.REI

Ideally, try the backpack loaded with 15–25 lb of weight before buying it. A comfortable empty backpack can become miserable when fully packed.

4. Choose a travel-friendly opening

For long trips, I'd strongly favor a clamshell/front-opening backpack.

Instead of reaching down through a narrow top opening, you can unzip it almost like a suitcase. That's particularly useful when you're constantly moving between hotels, hostels, trains and airports.WeRoad

Look for:

• Full or near-full clamshell opening
• Large main compartment
• Compression straps
• Separate laptop/tablet compartment if needed
• Small quick-access pocket
• Some internal organization—but not dozens of tiny pockets

Too much built-in organization can actually waste valuable space.

5. Keep the backpack itself light

A heavy backpack eats into your airline weight allowance before you've packed anything.

For one-bag travel, a roughly 2–4 lb empty weight is a useful target, depending on how much structure and suspension you need.Pack Hacker

Don't obsess over saving a few ounces, though. I'd take a slightly heavier bag with an excellent harness over an ultralight bag that hurts your shoulders.

6. Think about your actual trip

Your ideal backpack changes dramatically depending on the itinerary:

7. Don't overlook these details

For a long trip, I'd specifically check for:

• Durable zippers and stitching
• Water-resistant fabric
• Lockable zippers if you'll be in hostels
• Stowable shoulder straps if checking the bag
• External water-bottle pocket
• Compression system
• Easy-to-clean interior
• Good warranty/return policy

A rain cover can be worthwhile if you'll actually spend time outdoors; otherwise, water-resistant fabric plus waterproof packing cubes may be sufficient.

My simple buying formula

If you told me nothing else about your trip, I'd shop for:

35–40L + clamshell opening + comfortable adjustable harness + hip belt + lightweight construction + carry-on-compatible dimensions.

And before buying, load it with your intended gear and walk around for 20–30 minutes. That's a much better test than judging it while empty in a store.

There are some particularly strong current options in the 35–45L range, including the Cotopaxi Allpa, Osprey Farpoint, Aer Travel Pack, and Peak Design Travel Backpack; recent 2026 testing gives different models the edge depending on comfort, organization, tech storage, and budget.Pack Hacker+2

If you tell me your trip length, destination/climate, whether you're flying carry-on only, your budget, and whether you'll be hiking, I can narrow it down to 3–5 specific backpacks.