Solstice Anti-Theft Travel Backpack 18L

Sherpani Solstice Anti-Theft Travel Backpack 18L is a 18L, 0.91kg2lb travel backpack measuring 45.7×29.2×16.5cm18×11.5×6.5in. It fits the carry-on size limit of 36 of 36 major airlines and the personal-item limit of 1 of 26. Under the seat, its 45.7cm18in side is over the 40cm15.7in limit at 12 of the 25 airlines it misses. Specs from sherpani.com, checked October 2026.

Volume: 18Lfixed size
Weight: 0.91kg2lb2lb0.91kg
Carry-on: 36/36airlines fit it
Personal item: 1/26under-seat limits

Dimensions: 45.7×29.2×16.5cm18×11.5×6.5in 18×11.5×6.5in45.7×29.2×16.5cm
Price: $145 as of October 2026
Laptop: up to 15"
Opening: main zip with zipper lock clip, upper zip pocket, hidden front pockets
Warranty: Lifetime Fearless Lifetime Warranty covers the lifetime of the product, not the purchaser.
Compartments: n/a
Bottle pockets: 1

Organizer
Luggage pass-through

Material: Recycled nylon

Anti-theft: slash-proof bottom, chair loop lock, Hypalon loop zipper locks, RFID pocket
Dedicated tablet and phone sleeves
Product description says 14 in laptop; the spec list says 15 in, recorded 15
Sherpani lists dimensions without naming the axes; the longest side is recorded as height

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

Does the Sherpani Solstice Anti-Theft Travel Backpack 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	6.1kg to pack (of 7kg)13.4lb 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	11.1kg to pack (of 12kg shared with personal item)24.5lb to pack (of 26.5lb shared with personal item)
Air India	FitsFits	No published limit	6.1kg to pack (of 7kg)13.4lb to pack (of 15.4lb)
AirAsia	FitsFits	Too bigToo big	6.1kg to pack (of 7kg shared with personal item)13.4lb 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	Too bigToo big	No published limitNo published limit
American Airlines	FitsFits	Too bigToo big	No published limitNo published limit
ANA (All Nippon Airways)	FitsFits	Too bigToo big	9.1kg to pack (of 10kg shared with personal item)20.1lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	FitsFits	No published limit	9.1kg to pack (of 10kg)20.1lb to pack (of 22lb)
British Airways	FitsFits	Too bigToo big	No published limitNo published limit
Cebu Pacific	FitsFits	Too bigToo big	9.1kg to pack (of 10kg shared with personal item)20.1lb 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	Too bigToo big	14.1kg to pack (of 15kg)31.1lb to pack (of 33.1lb)
Emirates	FitsFits	No published limit	6.1kg to pack (of 7kg)13.4lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	FitsFits	Tight fit (0.3cm spare)Tight fit (0.1in spare)	15kg to pack (of 15.9kg)33.1lb to pack (of 35.1lb)
Gol Linhas Aereas	FitsFits	No published limit	9.1kg to pack (of 10kg)20.1lb to pack (of 22lb)
IndiGo	FitsFits	No published limit	6.1kg to pack (of 7kg)13.4lb 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	11.1kg to pack (of 12kg shared with personal item)24.5lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	FitsFits	Too bigToo big	11.1kg to pack (of 12kg)24.5lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	FitsFits	Too bigToo big	7.1kg to pack (of 8kg)15.7lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	FitsFits	Too bigToo big	9.1kg to pack (of 10kg shared with personal item)20.1lb to pack (of 22lb shared with personal item)
Qantas	FitsFits	No published limit	6.1kg to pack (of 7kg shared with personal item)13.4lb to pack (of 15.4lb shared with personal item)
Qatar Airways	FitsFits	No published limit	6.1kg to pack (of 7kg)13.4lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	FitsFits	Too bigToo big	9.1kg to pack (of 10kg)20.1lb to pack (of 22lb)
SAS	FitsFits	Too bigToo big	7.1kg to pack (of 8kg)15.7lb to pack (of 17.6lb)
Singapore Airlines	FitsFits	Too bigToo big	6.1kg to pack (of 7kg)13.4lb to pack (of 15.4lb)
Southwest Airlines	FitsFits	No published limit	No published limitNo published limit
Turkish Airlines	FitsFits	Too bigToo big	7.1kg to pack (of 8kg)15.7lb 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	6.1kg to pack (of 7kg shared with personal item)13.4lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	FitsFits	Too bigToo big	9.1kg to pack (of 10kg)20.1lb to pack (of 22lb)
VuelingCabin bag not on every fare	FitsFits	Too bigToo big	9.1kg to pack (of 10kg)20.1lb 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	9.1kg to pack (of 10kg)20.1lb 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 0.91kg2lb. Limits and sources. Own a different bag? Check it against every airline.