3 Way 18

Mystery Ranch 3 Way 18 is a 18L, 1.22kg2.7lb travel backpack measuring 27.9×41.9×31.8cm11×16.5×12.5in. It fits the carry-on size limit of 1 of 36 major airlines and the personal-item limit of 0 of 26. Under the seat, its 27.9cm11in side is over the 20cm7.9in limit at 15 of the 26 airlines it misses. Specs from mysteryranch.com, checked October 2026.

Volume: 18Lexpands to 23L
Weight: 1.22kg2.7lb2.7lb1.22kg
Carry-on: 1/36airlines fit it
Personal item: 0/26under-seat limits

Dimensions: 27.9×41.9×31.8cm11×16.5×12.5in 11×16.5×12.5in27.9×41.9×31.8cm
Price: $205 as of October 2026
Laptop: n/a
Opening: n/a
Warranty: Lifetime Warranty and repair for the practical lifetime of the pack.
Compartments: n/a
Bottle pockets: n/a

Organizer
Shoulder strap (removable)
Luggage pass-through

Material: CORDURA fabric; YKK AquaGuard water-repellent zippers

Converts between briefcase, shoulder bag and backpack; shoulder pads stow away
Expansion zipper adds 5 L
Main compartment divider with zippered pocket and stretch-woven detail pockets
Luggage handle slot on the body panel

Last checked: 2026-10. Prices and specs may have changed.

Does the Mystery Ranch 3 Way 18 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	5.8kg to pack (of 7kg)12.8lb 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	10.8kg to pack (of 12kg shared with personal item)23.8lb to pack (of 26.5lb shared with personal item)
Air India	Too bigToo big	No published limit	5.8kg to pack (of 7kg)12.8lb to pack (of 15.4lb)
AirAsia	Too bigToo big	Too bigToo big	5.8kg to pack (of 7kg shared with personal item)12.8lb 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	8.8kg to pack (of 10kg shared with personal item)19.4lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	Too bigToo big	No published limit	8.8kg to pack (of 10kg)19.4lb 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	8.8kg to pack (of 10kg shared with personal item)19.4lb 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	13.8kg to pack (of 15kg)30.4lb to pack (of 33.1lb)
Emirates	Too bigToo big	No published limit	5.8kg to pack (of 7kg)12.8lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	Too bigToo big	Too bigToo big	14.7kg to pack (of 15.9kg)32.4lb to pack (of 35.1lb)
Gol Linhas Aereas	Too bigToo big	No published limit	8.8kg to pack (of 10kg)19.4lb to pack (of 22lb)
IndiGo	Too bigToo big	No published limit	5.8kg to pack (of 7kg)12.8lb 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	10.8kg to pack (of 12kg shared with personal item)23.8lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	Too bigToo big	Too bigToo big	10.8kg to pack (of 12kg)23.8lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	Too bigToo big	Too bigToo big	6.8kg to pack (of 8kg)15lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	Too bigToo big	Too bigToo big	8.8kg to pack (of 10kg shared with personal item)19.4lb to pack (of 22lb shared with personal item)
Qantas	Too bigToo big	No published limit	5.8kg to pack (of 7kg shared with personal item)12.8lb to pack (of 15.4lb shared with personal item)
Qatar Airways	Too bigToo big	No published limit	5.8kg to pack (of 7kg)12.8lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	Too bigToo big	Too bigToo big	8.8kg to pack (of 10kg)19.4lb to pack (of 22lb)
SAS	Too bigToo big	Too bigToo big	6.8kg to pack (of 8kg)15lb to pack (of 17.6lb)
Singapore Airlines	FitsFits	Too bigToo big	5.8kg to pack (of 7kg)12.8lb 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	6.8kg to pack (of 8kg)15lb 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	5.8kg to pack (of 7kg shared with personal item)12.8lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	Too bigToo big	Too bigToo big	8.8kg to pack (of 10kg)19.4lb to pack (of 22lb)
VuelingCabin bag not on every fare	Too bigToo big	Too bigToo big	8.8kg to pack (of 10kg)19.4lb 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	8.8kg to pack (of 10kg)19.4lb 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 1.22kg2.7lb. Limits and sources. Own a different bag? Check it against every airline.