Mayhem EVO 30L Backpack

Mountainsmith Mayhem EVO 30L Backpack is a 29L, 1.76kg3.9lb travel backpack measuring 55.9×26.7×17.8cm22×10.5×7in. It fits the carry-on size limit of 15 of 36 major airlines and the personal-item limit of 0 of 26. Under the seat, its 55.9cm22in side is over the 40cm15.7in limit at 12 of the 26 airlines it misses. Specs from mountainsmith.com, checked September 2026.

Volume: 29Lfixed size
Weight: 1.76kg3.9lb3.9lb1.76kg
Carry-on: 15/36airlines fit it
Personal item: 0/26under-seat limits

Dimensions: 55.9×26.7×17.8cm22×10.5×7in 22×10.5×7in55.9×26.7×17.8cm
Price: $239.95 as of September 2026
Laptop: no laptop sleeve
Opening: Clamshell, Hybrid panel and top loader with wide clamshell style zippered main compartment
Warranty: Lifetime Covers material and workmanship defects, abuse and natural material aging may not be repairable.
Torso length: 38.1 to 48.3cm (15 to 19in)
Compartments: n/a
Bottle pockets: 2

Price history

$239.95 at every weekly check since Oct 5, 2026 (3 checks).

Checked weekly on the brand's US store.

Organizer
Hydration sleeve
Frame sheet (removable)
MOLLE
Hip belt
Sternum strap

Material: 420D nylon ripstop dobby with DWR, 150D high density polyester liner, YKK zippers

Listed as 30L but Mountainsmith publishes 1770 cu in / 29 L
Designed with Colorado search and rescue teams; reversible hi-vis blaze orange front panel
Removable foam framesheet with hoop frame; waistbelt with PALS webbing and a MOLLE style pouch
Hydration sleeve for up to 3 L (bladder not included); dual sternum straps; waistbelt 29 to 48 in

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

Does the Mountainsmith Mayhem EVO 30L 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	5.2kg to pack (of 7kg)11.5lb 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	10.2kg to pack (of 12kg shared with personal item)22.5lb to pack (of 26.5lb shared with personal item)
Air India	Too bigToo big	No published limit	5.2kg to pack (of 7kg)11.5lb to pack (of 15.4lb)
AirAsia	Tight fit (0.1cm spare)Tight fit (0in spare)	Too bigToo big	5.2kg to pack (of 7kg shared with personal item)11.5lb to pack (of 15.4lb shared with personal item)
Alaska Airlines	Tight fit (0.1cm spare)Tight fit (0in 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 (0.1cm spare)Tight fit (0in spare)	Too bigToo big	No published limitNo published limit
ANA (All Nippon Airways)	Too bigToo big	Too bigToo big	8.2kg to pack (of 10kg shared with personal item)18.1lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	Too bigToo big	No published limit	8.2kg to pack (of 10kg)18.1lb to pack (of 22lb)
British Airways	Tight fit (0.1cm spare)Tight fit (0in spare)	Too bigToo big	No published limitNo published limit
Cebu Pacific	Tight fit (0.1cm spare)Tight fit (0in spare)	Too bigToo big	8.2kg to pack (of 10kg shared with personal item)18.1lb to pack (of 22lb shared with personal item)
Delta Air Lines	Tight fit (0.1cm spare)Tight fit (0in spare)	No published limit	No published limitNo published limit
easyJetCabin bag not on every fare	Tight fit (0.1cm spare)Tight fit (0in spare)	Too bigToo big	13.2kg to pack (of 15kg)29.1lb to pack (of 33.1lb)
Emirates	Too bigToo big	No published limit	5.2kg to pack (of 7kg)11.5lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	FitsFits	Too bigToo big	14.1kg to pack (of 15.9kg)31.1lb to pack (of 35.1lb)
Gol Linhas Aereas	Too bigToo big	No published limit	8.2kg to pack (of 10kg)18.1lb to pack (of 22lb)
IndiGo	Too bigToo big	No published limit	5.2kg to pack (of 7kg)11.5lb to pack (of 15.4lb)
JetBlue Airways	Tight fit (0.1cm spare)Tight fit (0in spare)	Too bigToo big	No published limitNo published limit
KLMCabin bag not on every fare	Too bigToo big	Too bigToo big	10.2kg to pack (of 12kg shared with personal item)22.5lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	Too bigToo big	Too bigToo big	10.2kg to pack (of 12kg)22.5lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	Too bigToo big	Too bigToo big	6.2kg to pack (of 8kg)13.7lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	Too bigToo big	Too bigToo big	8.2kg to pack (of 10kg shared with personal item)18.1lb to pack (of 22lb shared with personal item)
Qantas	Tight fit (0.1cm spare)Tight fit (0in spare)	No published limit	5.2kg to pack (of 7kg shared with personal item)11.5lb to pack (of 15.4lb shared with personal item)
Qatar Airways	Too bigToo big	No published limit	5.2kg to pack (of 7kg)11.5lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	Too bigToo big	Too bigToo big	8.2kg to pack (of 10kg)18.1lb to pack (of 22lb)
SAS	Too bigToo big	Too bigToo big	6.2kg to pack (of 8kg)13.7lb to pack (of 17.6lb)
Singapore Airlines	FitsFits	Too bigToo big	5.2kg to pack (of 7kg)11.5lb to pack (of 15.4lb)
Southwest Airlines	FitsFits	No published limit	No published limitNo published limit
Turkish Airlines	Too bigToo big	Too bigToo big	6.2kg to pack (of 8kg)13.7lb to pack (of 17.6lb)
United AirlinesCabin bag not on every fare	Tight fit (0.1cm spare)Tight fit (0in spare)	Too bigToo big	No published limitNo published limit
Vietjet Air	Tight fit (0.1cm spare)Tight fit (0in spare)	Too bigToo big	5.2kg to pack (of 7kg shared with personal item)11.5lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	Too bigToo big	Too bigToo big	8.2kg to pack (of 10kg)18.1lb to pack (of 22lb)
VuelingCabin bag not on every fare	Too bigToo big	Too bigToo big	8.2kg to pack (of 10kg)18.1lb to pack (of 22lb)
WestJetCabin bag not on every fare	Tight fit (0.1cm spare)Tight fit (0in spare)	Too bigToo big	No published limitNo published limit
Wizz AirCabin bag not on every fare	Too bigToo big	Too bigToo big	8.2kg to pack (of 10kg)18.1lb 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 1.76kg3.9lb. Limits and sources. Own a different bag? Check it against every airline.