Aeronaut 45

Tom Bihn Aeronaut 45 is a 45L, 1.4kg3.1lb travel backpack measuring 36×56×23cm14×22×9in.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 23cm9.1in side is over the 20cm7.9in limit at 15 of the 26 airlines it misses. Specs from tombihn.com, checked September 2026.

Volume: 45Lfixed size
Weight: 1.4kg3.1lb3.1lb1.4kg
Carry-on: 14/36airlines fit it
Personal item: 0/26under-seat limits

Dimensions: 36×56×23cm14×22×9in 14×22×9in36×56×23cm
Price: $355 as of September 2026
Laptop: no laptop sleeve
Opening: Clamshell, clamshell (U-shape)
Warranty: Lifetime Fixes faults free of charge, wear and tear repairs are done at a reasonable charge.
Compartments: 5
Bottle pockets: 0

Price history

$355 at every weekly check since Oct 5, 2026 (3 checks).

Checked weekly on the brand's US store.

Water-resistant
Sternum strap
Shoulder strap

Material: U.S. 1050d high-tenacity ballistic nylon exterior (default Black 1050 Ballistic), 210d Cerylon ripstop interior (bluesign-certified)

Three-way carry: backpack, duffel, or shoulder bag (separate $40 Absolute Shoulder Strap accessory needed for shoulder-bag mode)
Two general-purpose quick-access pockets (not dedicated water-bottle pockets); one reviewer note says the non-zipper sleeve fits a small bottle
YKK Racquet-Coil water-repellent zippers
Weight varies 1190-1395g depending on fabric; 1395g (1050d Ballistic) is the default swatch shown

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

Does the Tom Bihn Aeronaut 45 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	5.6kg to pack (of 7kg)12.3lb 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	10.6kg to pack (of 12kg shared with personal item)23.4lb to pack (of 26.5lb shared with personal item)
Air India	Too bigToo big	No published limit	5.6kg to pack (of 7kg)12.3lb to pack (of 15.4lb)
AirAsia	Tight fit (no spare)Tight fit (no spare)	Too bigToo big	5.6kg to pack (of 7kg shared with personal item)12.3lb to pack (of 15.4lb shared with personal item)
Alaska Airlines	Tight fit (no spare)Tight fit (no spare)	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	Tight fit (no spare)Tight fit (no spare)	Too bigToo big	No published limitNo published limit
ANA (All Nippon Airways)	Too bigToo big	Too bigToo big	8.6kg to pack (of 10kg shared with personal item)19lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	Too bigToo big	No published limit	8.6kg to pack (of 10kg)19lb to pack (of 22lb)
British Airways	Tight fit (no spare)Tight fit (no spare)	Too bigToo big	No published limitNo published limit
Cebu Pacific	Tight fit (no spare)Tight fit (no spare)	Too bigToo big	8.6kg to pack (of 10kg shared with personal item)19lb to pack (of 22lb shared with personal item)
Delta Air Lines	Tight fit (no spare)Tight fit (no spare)	No published limit	No published limitNo published limit
easyJetCabin bag not on every fare	Tight fit (no spare)Tight fit (no spare)	Too bigToo big	13.6kg to pack (of 15kg)30lb to pack (of 33.1lb)
Emirates	Too bigToo big	No published limit	5.6kg to pack (of 7kg)12.3lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	FitsFits	Too bigToo big	14.5kg to pack (of 15.9kg)32lb to pack (of 35.1lb)
Gol Linhas Aereas	Too bigToo big	No published limit	8.6kg to pack (of 10kg)19lb to pack (of 22lb)
IndiGo	Too bigToo big	No published limit	5.6kg to pack (of 7kg)12.3lb to pack (of 15.4lb)
JetBlue Airways	Tight fit (no spare)Tight fit (no spare)	Too bigToo big	No published limitNo published limit
KLMCabin bag not on every fare	Too bigToo big	Too bigToo big	10.6kg to pack (of 12kg shared with personal item)23.4lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	Too bigToo big	Too bigToo big	10.6kg to pack (of 12kg)23.4lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	Too bigToo big	Too bigToo big	6.6kg to pack (of 8kg)14.6lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	Too bigToo big	Too bigToo big	8.6kg to pack (of 10kg shared with personal item)19lb to pack (of 22lb shared with personal item)
Qantas	Tight fit (no spare)Tight fit (no spare)	No published limit	5.6kg to pack (of 7kg shared with personal item)12.3lb to pack (of 15.4lb shared with personal item)
Qatar Airways	Too bigToo big	No published limit	5.6kg to pack (of 7kg)12.3lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	Too bigToo big	Too bigToo big	8.6kg to pack (of 10kg)19lb to pack (of 22lb)
SAS	Too bigToo big	Too bigToo big	6.6kg to pack (of 8kg)14.6lb to pack (of 17.6lb)
Singapore Airlines	Tight fit (no spare)Tight fit (no spare)	Too bigToo big	5.6kg to pack (of 7kg)12.3lb to pack (of 15.4lb)
Southwest Airlines	FitsFits	No published limit	No published limitNo published limit
Turkish Airlines	Too bigToo big	Too bigToo big	6.6kg to pack (of 8kg)14.6lb 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	Tight fit (no spare)Tight fit (no spare)	Too bigToo big	5.6kg to pack (of 7kg shared with personal item)12.3lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	Too bigToo big	Too bigToo big	8.6kg to pack (of 10kg)19lb to pack (of 22lb)
VuelingCabin bag not on every fare	Too bigToo big	Too bigToo big	8.6kg to pack (of 10kg)19lb to pack (of 22lb)
WestJetCabin bag not on every fare	Tight fit (no spare)Tight fit (no spare)	Too bigToo big	No published limitNo published limit
Wizz AirCabin bag not on every fare	Too bigToo big	Too bigToo big	8.6kg to pack (of 10kg)19lb 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 1.4kg3.1lb. Limits and sources. Own a different bag? Check it against every airline.