Series 2 Small Expandable Pack

Knack Series 2 Small Expandable Pack is a 17L, 1.08kg2.4lb travel backpack measuring 43.2×31.8×12.7cm17×12.5×5in. It fits the carry-on size limit of 36 of 36 major airlines and the personal-item limit of 7 of 26. Under the seat, its 43.2cm17in side is over the 40cm15.7in limit at 12 of the 19 airlines it misses. Specs from knackbags.com, checked September 2026.

Volume: 17Lexpands to 27L
Weight: 1.08kg2.4lb2.4lb1.08kg
Carry-on: 36/36airlines fit it
Personal item: 7/26under-seat limits

Dimensions: 43.2×31.8×12.7cm17×12.5×5in 17×12.5×5in43.2×31.8×12.7cm
Price: $225 as of September 2026
Laptop: up to 16"
Opening: Clamshell, top-access laptop pocket, suitcase-style lid on packing compartment
Warranty: not published
Compartments: n/a
Bottle pockets: 1

Price history

$225 at every weekly check since Oct 5, 2026 (3 checks).

Checked weekly on the brand's US store.

Organizer
Water-resistant
Luggage pass-through

Material: 420D high-density nylon with PU coating, 840D ballistic nylon bottom

Expands from 17 L to 27 L (depth 5 in to 9 in)
Shoulder straps tuck away to carry as a briefcase or tote
Side bottle pocket holds a 24 oz Hydro Flask
Lockable zippers and RFID-blocking lining

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

Does the Knack Series 2 Small Expandable Pack 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	5.9kg to pack (of 7kg)13lb 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	10.9kg to pack (of 12kg shared with personal item)24lb to pack (of 26.5lb shared with personal item)
Air India	FitsFits	No published limit	5.9kg to pack (of 7kg)13lb to pack (of 15.4lb)
AirAsia	FitsFits	Too bigToo big	5.9kg to pack (of 7kg shared with personal item)13lb 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	Tight fit (1.8cm spare)Tight fit (0.7in spare)	No published limitNo published limit
American Airlines	FitsFits	Tight fit (1.8cm spare)Tight fit (0.7in spare)	No published limitNo published limit
ANA (All Nippon Airways)	FitsFits	Too bigToo big	8.9kg to pack (of 10kg shared with personal item)19.6lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	FitsFits	No published limit	8.9kg to pack (of 10kg)19.6lb to pack (of 22lb)
British Airways	FitsFits	Tight fit (1.8cm spare)Tight fit (0.7in spare)	No published limitNo published limit
Cebu Pacific	FitsFits	Too bigToo big	8.9kg to pack (of 10kg shared with personal item)19.6lb 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	Tight fit (1.8cm spare)Tight fit (0.7in spare)	13.9kg to pack (of 15kg)30.6lb to pack (of 33.1lb)
Emirates	FitsFits	No published limit	5.9kg to pack (of 7kg)13lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	FitsFits	FitsFits	14.8kg to pack (of 15.9kg)32.6lb to pack (of 35.1lb)
Gol Linhas Aereas	FitsFits	No published limit	8.9kg to pack (of 10kg)19.6lb to pack (of 22lb)
IndiGo	FitsFits	No published limit	5.9kg to pack (of 7kg)13lb 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	10.9kg to pack (of 12kg shared with personal item)24lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	FitsFits	Tight fit (1.8cm spare)Tight fit (0.7in spare)	10.9kg to pack (of 12kg)24lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	FitsFits	Too bigToo big	6.9kg to pack (of 8kg)15.2lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	FitsFits	Too bigToo big	8.9kg to pack (of 10kg shared with personal item)19.6lb to pack (of 22lb shared with personal item)
Qantas	FitsFits	No published limit	5.9kg to pack (of 7kg shared with personal item)13lb to pack (of 15.4lb shared with personal item)
Qatar Airways	FitsFits	No published limit	5.9kg to pack (of 7kg)13lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	FitsFits	Too bigToo big	8.9kg to pack (of 10kg)19.6lb to pack (of 22lb)
SAS	FitsFits	Too bigToo big	6.9kg to pack (of 8kg)15.2lb to pack (of 17.6lb)
Singapore Airlines	FitsFits	Too bigToo big	5.9kg to pack (of 7kg)13lb to pack (of 15.4lb)
Southwest Airlines	FitsFits	No published limit	No published limitNo published limit
Turkish Airlines	FitsFits	Too bigToo big	6.9kg to pack (of 8kg)15.2lb 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	5.9kg to pack (of 7kg shared with personal item)13lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	FitsFits	Tight fit (1.8cm spare)Tight fit (0.7in spare)	8.9kg to pack (of 10kg)19.6lb to pack (of 22lb)
VuelingCabin bag not on every fare	FitsFits	Too bigToo big	8.9kg to pack (of 10kg)19.6lb 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	8.9kg to pack (of 10kg)19.6lb 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 1.08kg2.4lb. Limits and sources. Own a different bag? Check it against every airline.