Arc Haul Ultra 50L

Zpacks Arc Haul Ultra 50L is a 50L, 0.63kg1.4lb travel backpack measuring 74×31.8×16.5cm29×12.5×6.5in. It fits the carry-on size limit of 0 of 36 major airlines and the personal-item limit of 0 of 26. Under the seat, its 74cm29.1in side is over the 40cm15.7in limit at 12 of the 26 airlines it misses. Specs from zpacks.com, checked September 2026.

Volume: 50Lfixed size
Weight: 0.63kg1.4lb1.4lb0.63kg
Carry-on: 0/36airlines fit it
Personal item: 0/26under-seat limits

Dimensions: 74×31.8×16.5cm29×12.5×6.5in 29×12.5×6.5in74×31.8×16.5cm
Price: $399 as of September 2026
Laptop: no laptop sleeve
Opening: Roll-top, Roll top closure
Warranty: 2 years Limited warranty against manufacturing, material and design defects; repaired or replaced case by case.
Torso length: 40.6 to 66cm (16 to 26in)
Sizes: Short, Medium, Tall
Compartments: 1
Bottle pockets: 2

Price history

$399 at every weekly check since Oct 5, 2026 (3 checks).

Checked weekly on the brand's US store.

Hydration sleeve
Frame sheet
Water-resistant
Hip belt
Sternum strap
Load lifters

Material: Ultra 100X (3.3 oz/sqyd) with waterproof backing, stretch mesh pockets, taped seams, PFAS free

Curved carbon fiber Arc Frame with an air gap and patented torso adjustment; frame height 43, 51 or 58 cm by size
Zpacks says short and medium frames fit an overhead bin with the top rolled down to the frame
Weight for a medium torso with standard straps and a medium belt

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Last checked: 2026-09. Prices and specs may have changed.

Does the Zpacks Arc Haul Ultra 50L fit airline carry-on limits?

Draw against

Too bigToo big on Ryanair. cabin bag 55×40×20cm21.5×15.5×8in · under the seat 40×30×20cm15.5×12×8in. Bag in cminches, turned to fit.

Flag as a tight fit undercm spare

Airline	Carry-on	Personal item	Cabin-bag weight
Air Arabia	Too bigToo big	Too bigToo big	6.4kg to pack (of 7kg)14.1lb to pack (of 15.4lb)
Air CanadaCabin bag not on every fare	Too bigToo big	Too bigToo big	No published limitNo published limit
Air FranceCabin bag not on every fare	Too bigToo big	Too bigToo big	11.4kg to pack (of 12kg shared with personal item)25.1lb to pack (of 26.5lb shared with personal item)
Air India	Too bigToo big	No published limit	6.4kg to pack (of 7kg)14.1lb to pack (of 15.4lb)
AirAsia	Too bigToo big	Too bigToo big	6.4kg to pack (of 7kg shared with personal item)14.1lb to pack (of 15.4lb shared with personal item)
Alaska Airlines	Too bigToo big	No published limit	No published limitNo published limit
Allegiant AirCabin bag not on every fare	Too bigToo big	Too bigToo big	No published limitNo published limit
American Airlines	Too bigToo big	Too bigToo big	No published limitNo published limit
ANA (All Nippon Airways)	Too bigToo big	Too bigToo big	9.4kg to pack (of 10kg shared with personal item)20.7lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	Too bigToo big	No published limit	9.4kg to pack (of 10kg)20.7lb to pack (of 22lb)
British Airways	Too bigToo big	Too bigToo big	No published limitNo published limit
Cebu Pacific	Too bigToo big	Too bigToo big	9.4kg to pack (of 10kg shared with personal item)20.7lb to pack (of 22lb shared with personal item)
Delta Air Lines	Too bigToo big	No published limit	No published limitNo published limit
easyJetCabin bag not on every fare	Too bigToo big	Too bigToo big	14.4kg to pack (of 15kg)31.7lb to pack (of 33.1lb)
Emirates	Too bigToo big	No published limit	6.4kg to pack (of 7kg)14.1lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	Too bigToo big	Too bigToo big	15.3kg to pack (of 15.9kg)33.7lb to pack (of 35.1lb)
Gol Linhas Aereas	Too bigToo big	No published limit	9.4kg to pack (of 10kg)20.7lb to pack (of 22lb)
IndiGo	Too bigToo big	No published limit	6.4kg to pack (of 7kg)14.1lb to pack (of 15.4lb)
JetBlue Airways	Too bigToo big	Too bigToo big	No published limitNo published limit
KLMCabin bag not on every fare	Too bigToo big	Too bigToo big	11.4kg to pack (of 12kg shared with personal item)25.1lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	Too bigToo big	Too bigToo big	11.4kg to pack (of 12kg)25.1lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	Too bigToo big	Too bigToo big	7.4kg to pack (of 8kg)16.3lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	Too bigToo big	Too bigToo big	9.4kg to pack (of 10kg shared with personal item)20.7lb to pack (of 22lb shared with personal item)
Qantas	Too bigToo big	No published limit	6.4kg to pack (of 7kg shared with personal item)14.1lb to pack (of 15.4lb shared with personal item)
Qatar Airways	Too bigToo big	No published limit	6.4kg to pack (of 7kg)14.1lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	Too bigToo big	Too bigToo big	9.4kg to pack (of 10kg)20.7lb to pack (of 22lb)
SAS	Too bigToo big	Too bigToo big	7.4kg to pack (of 8kg)16.3lb to pack (of 17.6lb)
Singapore Airlines	Too bigToo big	Too bigToo big	6.4kg to pack (of 7kg)14.1lb to pack (of 15.4lb)
Southwest Airlines	Too bigToo big	No published limit	No published limitNo published limit
Turkish Airlines	Too bigToo big	Too bigToo big	7.4kg to pack (of 8kg)16.3lb to pack (of 17.6lb)
United AirlinesCabin bag not on every fare	Too bigToo big	Too bigToo big	No published limitNo published limit
Vietjet Air	Too bigToo big	Too bigToo big	6.4kg to pack (of 7kg shared with personal item)14.1lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	Too bigToo big	Too bigToo big	9.4kg to pack (of 10kg)20.7lb to pack (of 22lb)
VuelingCabin bag not on every fare	Too bigToo big	Too bigToo big	9.4kg to pack (of 10kg)20.7lb to pack (of 22lb)
WestJetCabin bag not on every fare	Too bigToo big	Too bigToo big	No published limitNo published limit
Wizz AirCabin bag not on every fare	Too bigToo big	Too bigToo big	9.4kg to pack (of 10kg)20.7lb to pack (of 22lb)

Compared in any orientation against each airline's published size limit. A tight fit has under 2cm to spare, so a packed soft bag may not pass a sizer. Set it to 0 to turn the warning off. Weight is what the airline allows in the cabin minus this bag's empty 0.63kg1.4lb. Limits and sources. Own a different bag? Check it against every airline.