Best Carry-On Travel Backpacks for One-Bag Travel (2026)

Skip the checked-bag queue, walk straight out of arrivals and keep your laptop, chargers and passport within reach: that's what a good carry-on backpack buys you. The hard part is finding one big enough for a week of clothes that still fits cabin limits. Here's how four popular travel packs compare on the specs their makers publish.

Comparison table

Specs are from Peak Design's and Bellroy's official product pages, checked 16 Oct 2026. Bellroy publishes its figures in inches and ounces.

Peak Design Travel Backpack 45L: the one-bag all-rounder

Top pick

Peak Design Travel Backpack 45L

• 35L standard / 30L compressed / 45L expanded
• Fits a 16-inch laptop
• 2.05kg

Best for: One-bag travellers who want one pack for every trip length

Check price

Peak Design describes the 45L as a carry-on travel backpack that "meets international carry-on size requirements" yet expands to a 45L gear-hauler and collapses to a 35L day bag. Its spec table lists 35L standard (max carry-on), 30L compressed and 45L expanded, with standard external dimensions of 56 × 33 × 24cm. It fits a 16" laptop and a 10" tablet, and weighs 2.05kg.

Access comes from the top, sides, front and rear, the main cavity can be split into two compartments, and the shoulder straps and hip belt tuck away. The shell is weatherproof 100% recycled 400D nylon with a 900D bottom liner.

Pros

• One bag that adapts from a long trip to a day out
• Opens from every side, so you're not digging from the top
• Tuck-away straps for checking or overhead bins

Cons

• The heaviest pack here at 2.05kg empty
• Packed out to 45L it may exceed stricter airline limits

Who it's for: one-bag travellers doing anything from a long weekend to a multi-week trip.

See the Peak Design Travel Backpack 45L

Peak Design Travel Backpack 30L: smaller and lighter

Best for shorter trips

Peak Design Travel Backpack 30L (Sage)

• 27L standard / 33L expanded
• Fits a 16-inch laptop
• 1.44kg

Best for: Weekend and week-long trips with a laptop

Check price

The 30L is the 45L's smaller sibling. According to Peak Design, it meets international carry-on size requirements in both expanded (33L) and compressed (27L) form. It has a large rear hatch for packing, an enlarged top pocket for keys, glasses and passport, padded laptop and tablet sleeves (it fits a 16" laptop), and expandable side pockets. It weighs 1.44kg, about 600g less than the 45L. Black stock was running very low when we checked Peak Design's site (16 Oct 2026), so we link to the Sage colourway, which had better availability.

Pros

• Carry-on friendly at both sizes
• Much lighter than the 45L
• Works as an everyday bag at home

Cons

• Tight for a full week of clothes in cooler climates
• Hip belt is an optional accessory

Who it's for: short-trip travellers and minimalists who carry a laptop.

See the Peak Design Travel Backpack 30L in Sage

Bellroy Lite Travel Pack (38L): big capacity, light weight

Lightest big pack

Bellroy Lite Travel Pack (38L)

• 38L capacity
• Rear laptop pocket fits 16-inch laptops
• 35.3oz (about 1kg)

Best for: Travellers who want big capacity at about 1kg

Check price

Bellroy lists the Lite Travel Pack at 38L, 35.3oz (Bellroy also calls it "super lightweight at 1kg") and 20.5 × 14.6 × 6.7 in. The listing also names a 30L size. It opens clamshell-style and folds out flat, with internal mesh packing cells and dividers, a quick-access top pocket for your passport, a rear zip-up laptop pocket that fits 16" laptops, tuck-away straps and a luggage pass-through to slide over a roller handle. Bellroy backs it with a 6-year warranty.

Pros

• Roughly half the weight of the Peak Design 45L
• Built-in packing cells, so you may not need cubes
• Luggage pass-through for trips with a suitcase

Cons

• Bellroy doesn't list an expand/compress system like the Peak Design packs
• Bellroy publishes only imperial measurements, so convert before checking airline limits

Who it's for: travellers who care most about weight, especially on airlines that weigh cabin bags.

See the Bellroy Lite Travel Pack

Peak Design Travel Backpack 20L: the personal item

Best personal item

Peak Design Travel Backpack 20L

• 20L min / 23L max
• Laptop sleeve fits up to a 16-inch MacBook Pro
• 1150g

Best for: A personal-item bag that pairs with a roller

Check price

Peak Design pitches the 20L as a personal item that works alone or with a roller. Its spec table lists 20L min, 23L max, standard external dimensions of 46 × 30 × 14.5cm, a weight of 1150g, and a laptop sleeve that fits up to a 16" MacBook Pro, plus a tablet sleeve for up to an 11" iPad. It has an expandable main compartment, a hidden water bottle and AirTag pocket, and magnetic strap keepers.

Pros

• Designed by Peak Design as a personal item
• Full-size laptop sleeve in a compact bag

Cons

• Tight as your only bag for anything longer than a weekend

Who it's for: anyone flying with a roller or a strict personal-item allowance.

See the Peak Design Travel Backpack 20L

How to choose a carry-on travel backpack

• Check your airline first. Cabin limits differ between airlines and fare types, and budget carriers are often stricter. Compare the bag's external dimensions, not its litres, with your airline's limit.
• Expandable or fixed? Expanding packs (like the Peak Design 45L and 30L) give you room on the way home, but pack to the standard size at the gate.
• Weight matters. Some airlines cap cabin bag weight, and a heavy empty bag leaves less allowance for your stuff.
• Laptop access. A separate laptop sleeve or pocket makes airport security quicker.
• Organise the inside. A tech pouch keeps chargers and cables together. Pair it with an airline-safe power bank and a luggage tracker.

FAQ

Conclusion

For most one-bag travellers, the Peak Design Travel Backpack 45L is the most flexible choice: it compresses for the cabin and expands when you need it. If you travel lighter or for shorter trips, the 30L saves weight. If every gram counts, the Bellroy Lite Travel Pack offers 38L at about 1kg. Flying with a roller? The 20L is the personal item to pair with it.

Check today's prices: Peak Design travel backpacks · Bellroy travel packs