Duffel backpacks pack like a duffel and carry like a backpack for short walks.
These are the best 40L hybrids.
The Outdoor Recreation is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Quick Picks
- Best overall: Thule Chasm Duffel
- Best light: Osprey Daylite 45L Duffel
- Best tough: Osprey Transporter Duffel 40
- Best waterproof: MIER 40L Duffel Backpack
- Best organization: BAGSMART 4-in-1 40L Duffel
Comparison Table
| Product | Best for | Capacity | Standout feature | |
|---|---|---|---|---|
| Thule Chasm Duffel | Best overall | 40L size | 840D waterproof laminate | View |
| Osprey Daylite 45L Duffel | Best light | 45L | Tuck-away padded harness | View |
| Osprey Transporter Duffel 40 | Best tough | 40L | NanoTough, lockable U-zip | View |
| MIER 40L Duffel Backpack | Best waterproof | 40L | Tarpaulin, stowable straps | View |
| BAGSMART 4-in-1 40L Duffel | Best organization | 40L | Shoe compartment, wet pocket | View |
Detailed Reviews
1Thule’s Chasm is a rugged, weather-resistant duffel made from 840D nylon with a waterproof laminate. It has a wide-mouth opening and converts from duffel to backpack in seconds.
Internal mesh pockets organize small items. The Chasm comes in several sizes; choose the 40L version for carry-on and long-weekend trips. It is the duffel we would trust on a rainy boat dock or a dusty truck bed.
Pros & Cons
What we like
- Very tough 840D laminate
- Wide-mouth opening
- Converts to backpack
Watch out for
- Backpack straps are basic
- Pick the size carefully
Key Specs
- Capacity: choose the 40L size
- Fabric: 840D nylon, waterproof laminate
- Carry: duffel or backpack
- Organization: internal mesh pockets
2Osprey’s Daylite Duffel 45 carries as a backpack, over the shoulder or by the grab handles. The mesh-covered, EVA-foam-padded harness tucks away when you do not need it.
A big U-zip main compartment, an end zip pocket and a horizontal side pocket handle clothes, gym shoes and travel items. It suits gym-to-weekend use and short trips where you want a duffel shape with comfortable backpack carry.
Pros & Cons
What we like
- Comfortable padded harness
- Big U-zip opening
- Three carry modes
Watch out for
- Little internal organization
- 45L may exceed some carry-on limits
Key Specs
- Capacity: 45 liters
- Carry: backpack, shoulder, handles
- Opening: U-zip
- Harness: tuck-away, EVA foam
3The Osprey Transporter is a 40L duffel built from highly water-resistant NanoTough fabric. Osprey says it fits airline carry-on requirements, and a large lockable U-zip opens the main compartment wide.
Removable backpack straps let you carry it hands-free between the car and the trailhead or the terminal. It is our pick for travelers who want Osprey quality in a duffel.
Pros & Cons
What we like
- Water-resistant NanoTough fabric
- Lockable U-zip
- Carry-on size
Watch out for
- Backpack carry is basic
- Premium pricing
Key Specs
- Capacity: 40 liters
- Fabric: NanoTough
- Opening: lockable U-zip
- Carry: backpack straps, handles
4The MIER duffel backpack is a heavy-duty, water-resistant tarpaulin duffel with padded backpack straps that tuck into a side pocket when you do not need them. It comes in 40L, 60L and 90L sizes.
Two haul handles and four grab handles make it easy to throw into a truck bed or boat, and the reinforced double bottom handles wet ground. It is our pick for gear-hauling trips where a zippered backpack would get soaked or scuffed.
Pros & Cons
What we like
- Tough, wipe-clean tarpaulin
- Straps stow away
- Many grab handles
Watch out for
- Simple interior
- Tarpaulin is stiff when cold
Key Specs
- Capacity: 40 liters (also 60L, 90L)
- Fabric: water-resistant tarpaulin
- Carry: backpack, duffel, grab handles
- Base: reinforced double bottom
5BAGSMART’s 4-in-1 duffel switches between backpack, duffel, shoulder bag and luggage-handle carry. The brand lists it at 21.6 x 13.7 x 8.6 inches with 40 liters of space.
A separate shoe compartment and a waterproof pocket keep dirty or wet items away from clean clothes, which makes it a strong gym-to-weekend bag. It is a value pick for travelers who want duffel convenience with backpack carry.
Pros & Cons
What we like
- Four carry modes
- Separate shoe compartment
- Waterproof wet pocket
Watch out for
- Straps less padded than Osprey
- Soft shape slumps when half full
Key Specs
- Capacity: 40 liters
- Size: 21.6 x 13.7 x 8.6 in (brand listing)
- Compartments: shoe, wet pocket, main
- Carry: 4-in-1
How We Chose
We compared capacity, fit range, weight, carry system, materials, pockets and carry-on dimensions across dozens of backpacks, then read verified owner feedback to find comfort and durability problems that spec sheets miss. We did not receive free products, and we do not claim hands-on testing. TOR Scores combine published specs, verified owner feedback and overall value. You may also find our guide to the best 40L camping backpack helpful.
Duffel Backpack vs Travel Backpack
A duffel backpack is a duffel bag first and a backpack second. It has a big, simple main compartment, tough fabric and straps that stow away. A travel backpack has a harness built for walking and more organization. Related: our shortlist of the best 40L camera backpack.
- Choose a duffel for road trips, boat trips, gym bags, gear hauling and any trip where you mostly carry the bag from car to room.
- Choose a travel backpack if you will walk more than 15 minutes with your bag, take trains and buses, or move between hostels.
- Fabric. Tarpaulin and laminated fabrics, like the MIER and Thule Chasm, shrug off rain, mud and boat spray.
- Straps. Padded, contoured straps (Osprey Daylite Duffel) are comfortable for longer carries; thin webbing straps are only for short walks.
How to Choose a 40L Travel Backpack
A 40L travel backpack is the classic one-bag size. It holds a week or more of clothes and usually still fits within carry-on limits, so you skip checked-bag fees and baggage-claim waits. For a different angle, see our picks for the best 40L backpack with wheels.
- Carry-on size. Many US airlines allow carry-on bags around 22 x 14 x 9 inches, but international and budget carriers are often stricter. Always check your airline before you fly.
- Clamshell opening. A zip that opens the bag like a suitcase makes packing and finding items much easier than a top-loader.
- Compression. Straps that cinch a half-full bag keep it inside size limits and stop contents from shifting.
- Laptop sleeve. A separate sleeve speeds up security screening and protects your device.
- Harness. Padded straps, a sternum strap and a hip belt make a big difference when you walk from the station to your hotel.
- Security. Lockable zippers and hidden pockets help in crowded places.
Packing cubes turn a 40L bag into a tidy, easy-to-unpack system. Roll clothes rather than fold them, and wear your bulkiest shoes and jacket on travel days. If you are comparing options, our guide to the best 40L backpack travel picks is worth a look.
Carry-On Rules for 40L Backpacks
Liters measure volume, not dimensions, so a 40L pack can be either carry-on friendly or too long depending on its shape. Check the listed dimensions, not just the capacity. For a closer look, see our guide to the best 40L backpack for travel.
- Main carry-on. Many US carriers allow roughly 22 x 14 x 9 inches. Most 40L travel packs are built around that size.
- Personal item. Budget airlines often limit free personal items to about 18 x 14 x 8 inches or less. The LOVEVOOK 40L is marketed for that size, but rules vary by airline and fare.
- Weight limits. Some international airlines cap carry-on weight at 7 to 10 kg. Heavy wheeled bags use up a lot of that allowance before you pack anything.
- Liquids. Keep liquids, gels and aerosols in a quart-size bag in an outside pocket so you can pull them out quickly.
Gate agents care about how the bag looks, too. A compressed, tidy pack that fits the sizer is far less likely to be challenged than an overstuffed one.
Related guides: best 40l backpack duffel, best 40l dry bag backpack, best 40l travel backpack carry on. Browse every pick in our Backpacks category.
Sources and further reading: National Park Service: the Ten Essentials, Leave No Trace: the 7 Principles and National Park Service: camping basics. Product specs come from brand listings on Amazon; always check your airline’s current carry-on size rules before you fly.
Frequently Asked Questions
Is a duffel backpack comfortable for long walks?
Duffel backpacks are best for short carries; for long walks, a travel backpack with a padded hip belt is more comfortable.
Is a 40L backpack carry-on size?
Many are designed around common carry-on limits, but airlines differ; check dimensions and your airline’s rules.
Are 40L backpacks waterproof?
Most are water resistant; use a rain cover or liner, or choose a roll-top waterproof pack.
How much should a 40L pack weigh?
Frameless packs can be about 1 to 2 lb; framed hiking and travel packs often weigh 2.5 to 4 lb.
How do I clean a backpack?
Empty it, brush out dirt, hand wash with mild soap and air dry; avoid machine washing unless allowed.
Final Verdict
The Thule Chasm 40L is the best duffel backpack.
Write Your Review
No reviews yet. Be the first to share your experience!