Trailblazer 18L

Montane Trailblazer 18L is a 18L, 0.44kg1lb travel backpack measuring 45×24×18cm17.5×9.5×7in. It fits the carry-on size limit of 36 of 36 major airlines and the personal-item limit of 7 of 26. Under the seat, its 45cm17.7in side is over the 40cm15.7in limit at 12 of the 19 airlines it misses. Specs from montane.com, checked October 2026.

Volume: 18Lfixed size
Weight: 0.44kg1lb1lb0.44kg
Carry-on: 36/36airlines fit it
Personal item: 7/26under-seat limits

Dimensions: 45×24×18cm17.5×9.5×7in 17.5×9.5×7in45×24×18cm
Price: $100 as of October 2026
Laptop: n/a
Opening: Large main pocket with internal organisation
Warranty: Lifetime Guaranteed for life against faults in workmanship and materials.
Compartments: n/a
Bottle pockets: 2

Hydration sleeve
Water-resistant
Hip belt
Sternum strap

Material: RAPTOR CROSS LITE 70D 100% recycled nylon with PFC-free DWR

COVALENT body-mapped harness with two off-centre chest straps
Shoulder strap pockets fit soft flasks or hard bottles
Hidden security pocket with key clip under the mesh front pocket

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

Does the Montane Trailblazer 18L fit airline carry-on limits?

Draw against

Fits as a cabin bagFits as a cabin bag 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	FitsFits	Too bigToo big	6.6kg to pack (of 7kg)14.6lb to pack (of 15.4lb)
Air CanadaCabin bag not on every fare	FitsFits	Too bigToo big	No published limitNo published limit
Air FranceCabin bag not on every fare	FitsFits	Too bigToo big	11.6kg to pack (of 12kg shared with personal item)25.6lb to pack (of 26.5lb shared with personal item)
Air India	FitsFits	No published limit	6.6kg to pack (of 7kg)14.6lb to pack (of 15.4lb)
AirAsia	FitsFits	Too bigToo big	6.6kg to pack (of 7kg shared with personal item)14.6lb to pack (of 15.4lb shared with personal item)
Alaska Airlines	FitsFits	No published limit	No published limitNo published limit
Allegiant AirCabin bag not on every fare	FitsFits	Tight fit (no spare)Tight fit (no spare)	No published limitNo published limit
American Airlines	FitsFits	Tight fit (no spare)Tight fit (no spare)	No published limitNo published limit
ANA (All Nippon Airways)	FitsFits	Too bigToo big	9.6kg to pack (of 10kg shared with personal item)21.2lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	FitsFits	No published limit	9.6kg to pack (of 10kg)21.2lb to pack (of 22lb)
British Airways	FitsFits	Tight fit (no spare)Tight fit (no spare)	No published limitNo published limit
Cebu Pacific	FitsFits	Too bigToo big	9.6kg to pack (of 10kg shared with personal item)21.2lb to pack (of 22lb shared with personal item)
Delta Air Lines	FitsFits	No published limit	No published limitNo published limit
easyJetCabin bag not on every fare	FitsFits	Tight fit (no spare)Tight fit (no spare)	14.6kg to pack (of 15kg)32.2lb to pack (of 33.1lb)
Emirates	FitsFits	No published limit	6.6kg to pack (of 7kg)14.6lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	FitsFits	Tight fit (1cm spare)Tight fit (0.4in spare)	15.5kg to pack (of 15.9kg)34.2lb to pack (of 35.1lb)
Gol Linhas Aereas	FitsFits	No published limit	9.6kg to pack (of 10kg)21.2lb to pack (of 22lb)
IndiGo	FitsFits	No published limit	6.6kg to pack (of 7kg)14.6lb to pack (of 15.4lb)
JetBlue Airways	FitsFits	Too bigToo big	No published limitNo published limit
KLMCabin bag not on every fare	FitsFits	Too bigToo big	11.6kg to pack (of 12kg shared with personal item)25.6lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	FitsFits	Tight fit (no spare)Tight fit (no spare)	11.6kg to pack (of 12kg)25.6lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	FitsFits	Too bigToo big	7.6kg to pack (of 8kg)16.8lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	FitsFits	Too bigToo big	9.6kg to pack (of 10kg shared with personal item)21.2lb to pack (of 22lb shared with personal item)
Qantas	FitsFits	No published limit	6.6kg to pack (of 7kg shared with personal item)14.6lb to pack (of 15.4lb shared with personal item)
Qatar Airways	FitsFits	No published limit	6.6kg to pack (of 7kg)14.6lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	FitsFits	Too bigToo big	9.6kg to pack (of 10kg)21.2lb to pack (of 22lb)
SAS	FitsFits	Too bigToo big	7.6kg to pack (of 8kg)16.8lb to pack (of 17.6lb)
Singapore Airlines	FitsFits	Too bigToo big	6.6kg to pack (of 7kg)14.6lb to pack (of 15.4lb)
Southwest Airlines	FitsFits	No published limit	No published limitNo published limit
Turkish Airlines	FitsFits	Too bigToo big	7.6kg to pack (of 8kg)16.8lb to pack (of 17.6lb)
United AirlinesCabin bag not on every fare	FitsFits	Too bigToo big	No published limitNo published limit
Vietjet Air	FitsFits	Too bigToo big	6.6kg to pack (of 7kg shared with personal item)14.6lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	FitsFits	Tight fit (no spare)Tight fit (no spare)	9.6kg to pack (of 10kg)21.2lb to pack (of 22lb)
VuelingCabin bag not on every fare	FitsFits	Too bigToo big	9.6kg to pack (of 10kg)21.2lb to pack (of 22lb)
WestJetCabin bag not on every fare	FitsFits	Too bigToo big	No published limitNo published limit
Wizz AirCabin bag not on every fare	FitsFits	Too bigToo big	9.6kg to pack (of 10kg)21.2lb 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 0.44kg1lb. Limits and sources. Own a different bag? Check it against every airline.