Sirac Plus 50

Lowe Alpine Sirac Plus 50 is a 50L, 1.98kg4.4lb travel backpack measuring 80×41×33cm31.5×16×13in. 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 33cm13in side is over the 20cm7.9in limit at 15 of the 26 airlines it misses. Specs from lowealpine.com, checked October 2026.

Volume: 50Lfixed size
Weight: 1.98kg4.4lb4.4lb1.98kg
Carry-on: 0/36airlines fit it
Personal item: 0/26under-seat limits

Dimensions: 80×41×33cm31.5×16×13in 31.5×16×13in80×41×33cm
Price: no US price
Laptop: n/a
Opening: Top-loading, Lidded top opening plus zipped front and lower entry, with an internal divider
Warranty: not published
Compartments: 2
Bottle pockets: 2

Hydration sleeve
Rain cover (removable)
Hip belt
Sternum strap

Material: Recycled fabrics

Adjustable Air Contour X carry system
Two back lengths: M-L 48 to 53 cm, L-XL 53 to 58 cm
Zipped front and lower entry with internal divider
Integrated, detachable rain cover

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

Does the Lowe Alpine Sirac Plus 50 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	5kg to pack (of 7kg)11lb 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	10kg to pack (of 12kg shared with personal item)22lb to pack (of 26.5lb shared with personal item)
Air India	Too bigToo big	No published limit	5kg to pack (of 7kg)11lb to pack (of 15.4lb)
AirAsia	Too bigToo big	Too bigToo big	5kg to pack (of 7kg shared with personal item)11lb 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	8kg to pack (of 10kg shared with personal item)17.6lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	Too bigToo big	No published limit	8kg to pack (of 10kg)17.6lb 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	8kg to pack (of 10kg shared with personal item)17.6lb 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	13kg to pack (of 15kg)28.7lb to pack (of 33.1lb)
Emirates	Too bigToo big	No published limit	5kg to pack (of 7kg)11lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	Too bigToo big	Too bigToo big	13.9kg to pack (of 15.9kg)30.6lb to pack (of 35.1lb)
Gol Linhas Aereas	Too bigToo big	No published limit	8kg to pack (of 10kg)17.6lb to pack (of 22lb)
IndiGo	Too bigToo big	No published limit	5kg to pack (of 7kg)11lb 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	10kg to pack (of 12kg shared with personal item)22lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	Too bigToo big	Too bigToo big	10kg to pack (of 12kg)22lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	Too bigToo big	Too bigToo big	6kg to pack (of 8kg)13.2lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	Too bigToo big	Too bigToo big	8kg to pack (of 10kg shared with personal item)17.6lb to pack (of 22lb shared with personal item)
Qantas	Too bigToo big	No published limit	5kg to pack (of 7kg shared with personal item)11lb to pack (of 15.4lb shared with personal item)
Qatar Airways	Too bigToo big	No published limit	5kg to pack (of 7kg)11lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	Too bigToo big	Too bigToo big	8kg to pack (of 10kg)17.6lb to pack (of 22lb)
SAS	Too bigToo big	Too bigToo big	6kg to pack (of 8kg)13.2lb to pack (of 17.6lb)
Singapore Airlines	Too bigToo big	Too bigToo big	5kg to pack (of 7kg)11lb 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	6kg to pack (of 8kg)13.2lb 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	5kg to pack (of 7kg shared with personal item)11lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	Too bigToo big	Too bigToo big	8kg to pack (of 10kg)17.6lb to pack (of 22lb)
VuelingCabin bag not on every fare	Too bigToo big	Too bigToo big	8kg to pack (of 10kg)17.6lb 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	8kg to pack (of 10kg)17.6lb 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 1.98kg4.4lb. Limits and sources. Own a different bag? Check it against every airline.