Subterra 2 Travel Backpack

Thule Subterra 2 Travel Backpack is a 26L, 1.3kg2.9lb travel backpack measuring 51×33×24cm20×13×9.5in. It fits the carry-on size limit of 14 of 36 major airlines and the personal-item limit of 0 of 26. Under the seat, its 24cm9.4in side is over the 20cm7.9in limit at 15 of the 26 airlines it misses. Specs from thule.com, checked September 2026.

Volume: 26Lexpands to 32L
Weight: 1.3kg2.9lb2.9lb1.3kg
Carry-on: 14/36airlines fit it
Personal item: 0/26under-seat limits

Dimensions: 51×33×24cm20×13×9.5in 20×13×9.5in51×33×24cm
Price: $170 as of September 2026
Laptop: up to 16"
Opening: Panel access, Two-way access: fold-over top opening or full back-panel access
Warranty: Lifetime Limited lifetime cover for defects in materials or workmanship, not wear, accidents or misuse.
Compartments: n/a
Bottle pockets: n/a

Organizer
Water-resistant
Shoulder strap
Luggage pass-through

Material: bluesign approved 800D nylon/polyester

Padded tablet sleeve fits up to 10.9" tablet
Includes a removable packing cube and a hidden back-panel security pocket
Exact 34L capacity of the original Subterra is gone; 26L (expandable to 32L) is the closest current travel-backpack equivalent

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

Does the Thule Subterra 2 Travel Backpack 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	5.7kg to pack (of 7kg)12.6lb 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	Tight fit (1cm spare)Tight fit (0.4in spare)	Too bigToo big	10.7kg to pack (of 12kg shared with personal item)23.6lb to pack (of 26.5lb shared with personal item)
Air India	Too bigToo big	No published limit	5.7kg to pack (of 7kg)12.6lb to pack (of 15.4lb)
AirAsia	Too bigToo big	Too bigToo big	5.7kg to pack (of 7kg shared with personal item)12.6lb 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	Tight fit (1cm spare)Tight fit (0.4in spare)	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)	Tight fit (1cm spare)Tight fit (0.4in spare)	Too bigToo big	8.7kg to pack (of 10kg shared with personal item)19.2lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	Tight fit (1cm spare)Tight fit (0.4in spare)	No published limit	8.7kg to pack (of 10kg)19.2lb to pack (of 22lb)
British Airways	Tight fit (1cm spare)Tight fit (0.4in spare)	Too bigToo big	No published limitNo published limit
Cebu Pacific	Too bigToo big	Too bigToo big	8.7kg to pack (of 10kg shared with personal item)19.2lb 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	Tight fit (1cm spare)Tight fit (0.4in spare)	Too bigToo big	13.7kg to pack (of 15kg)30.2lb to pack (of 33.1lb)
Emirates	Too bigToo big	No published limit	5.7kg to pack (of 7kg)12.6lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	Tight fit (1cm spare)Tight fit (0.4in spare)	Too bigToo big	14.6kg to pack (of 15.9kg)32.2lb to pack (of 35.1lb)
Gol Linhas Aereas	Tight fit (1cm spare)Tight fit (0.4in spare)	No published limit	8.7kg to pack (of 10kg)19.2lb to pack (of 22lb)
IndiGo	Tight fit (1cm spare)Tight fit (0.4in spare)	No published limit	5.7kg to pack (of 7kg)12.6lb to pack (of 15.4lb)
JetBlue Airways	Too bigToo big	Too bigToo big	No published limitNo published limit
KLMCabin bag not on every fare	Tight fit (1cm spare)Tight fit (0.4in spare)	Too bigToo big	10.7kg to pack (of 12kg shared with personal item)23.6lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	Tight fit (1cm spare)Tight fit (0.4in spare)	Too bigToo big	10.7kg to pack (of 12kg)23.6lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	Too bigToo big	Too bigToo big	6.7kg to pack (of 8kg)14.8lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	Too bigToo big	Too bigToo big	8.7kg to pack (of 10kg shared with personal item)19.2lb to pack (of 22lb shared with personal item)
Qantas	Too bigToo big	No published limit	5.7kg to pack (of 7kg shared with personal item)12.6lb to pack (of 15.4lb shared with personal item)
Qatar Airways	Too bigToo big	No published limit	5.7kg to pack (of 7kg)12.6lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	Too bigToo big	Too bigToo big	8.7kg to pack (of 10kg)19.2lb to pack (of 22lb)
SAS	Too bigToo big	Too bigToo big	6.7kg to pack (of 8kg)14.8lb to pack (of 17.6lb)
Singapore Airlines	FitsFits	Too bigToo big	5.7kg to pack (of 7kg)12.6lb to pack (of 15.4lb)
Southwest Airlines	Tight fit (1cm spare)Tight fit (0.4in spare)	No published limit	No published limitNo published limit
Turkish Airlines	Too bigToo big	Too bigToo big	6.7kg to pack (of 8kg)14.8lb 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	5.7kg to pack (of 7kg shared with personal item)12.6lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	Tight fit (1cm spare)Tight fit (0.4in spare)	Too bigToo big	8.7kg to pack (of 10kg)19.2lb to pack (of 22lb)
VuelingCabin bag not on every fare	Too bigToo big	Too bigToo big	8.7kg to pack (of 10kg)19.2lb 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	8.7kg to pack (of 10kg)19.2lb 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 1.3kg2.9lb. Limits and sources. Own a different bag? Check it against every airline.