Shape Shifter 25L

Think Tank Shape Shifter 25L is a 25L, 1.72kg3.8lb travel backpack measuring 43×30×17.9cm17×12×7in. It fits the carry-on size limit of 36 of 36 major airlines and the personal-item limit of 8 of 26. Under the seat, its 43cm16.9in side is over the 40cm15.7in limit at 12 of the 18 airlines it misses. Specs from thinktankphoto.com, checked September 2026.

Volume: 25Lfixed size
Weight: 1.72kg3.8lb3.8lb1.72kg
Carry-on: 36/36airlines fit it
Personal item: 8/26under-seat limits

Dimensions: 43×30×17.9cm17×12×7in 17×12×7in43×30×17.9cm
Price: $299.75 as of September 2026
Laptop: up to 15"
Opening: n/a
Warranty: Lifetime Covers defects in materials and workmanship, not normal wear, accidents or cosmetic issues.
Compartments: n/a
Bottle pockets: n/a

Price history

$299.75 at every weekly check since Oct 5, 2026 (3 checks).

Checked weekly on the brand's US store.

Organizer
Rain cover
Hip belt (removable)
Sternum strap
Luggage pass-through
Camera compartment

Material: 420D Velocity nylon, 300D diamond weave polyester, 600D polyester

Compresses from 17.9 cm to 10 cm deep
Divider-free, reconfigurable gear pouches
Front pockets fit a 70-200mm f/2.8

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

Does the Think Tank Shape Shifter 25L 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	5.3kg to pack (of 7kg)11.7lb 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	10.3kg to pack (of 12kg shared with personal item)22.7lb to pack (of 26.5lb shared with personal item)
Air India	FitsFits	No published limit	5.3kg to pack (of 7kg)11.7lb to pack (of 15.4lb)
AirAsia	FitsFits	Too bigToo big	5.3kg to pack (of 7kg shared with personal item)11.7lb 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	FitsFits	No published limitNo published limit
American Airlines	FitsFits	FitsFits	No published limitNo published limit
ANA (All Nippon Airways)	FitsFits	Too bigToo big	8.3kg to pack (of 10kg shared with personal item)18.3lb to pack (of 22lb shared with personal item)
AviancaCabin bag not on every fare	FitsFits	No published limit	8.3kg to pack (of 10kg)18.3lb to pack (of 22lb)
British Airways	FitsFits	FitsFits	No published limitNo published limit
Cebu Pacific	FitsFits	Too bigToo big	8.3kg to pack (of 10kg shared with personal item)18.3lb 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	FitsFits	13.3kg to pack (of 15kg)29.3lb to pack (of 33.1lb)
Emirates	FitsFits	No published limit	5.3kg to pack (of 7kg)11.7lb to pack (of 15.4lb)
Frontier AirlinesCabin bag not on every fare	FitsFits	FitsFits	14.2kg to pack (of 15.9kg)31.3lb to pack (of 35.1lb)
Gol Linhas Aereas	FitsFits	No published limit	8.3kg to pack (of 10kg)18.3lb to pack (of 22lb)
IndiGo	FitsFits	No published limit	5.3kg to pack (of 7kg)11.7lb to pack (of 15.4lb)
JetBlue Airways	FitsFits	Tight fit (no spare)Tight fit (no spare)	No published limitNo published limit
KLMCabin bag not on every fare	FitsFits	Too bigToo big	10.3kg to pack (of 12kg shared with personal item)22.7lb to pack (of 26.5lb shared with personal item)
LATAM Airlines	FitsFits	FitsFits	10.3kg to pack (of 12kg)22.7lb to pack (of 26.5lb)
LufthansaCabin bag not on every fare	FitsFits	Too bigToo big	6.3kg to pack (of 8kg)13.9lb to pack (of 17.6lb)
Norwegian Air ShuttleCabin bag not on every fare	FitsFits	Too bigToo big	8.3kg to pack (of 10kg shared with personal item)18.3lb to pack (of 22lb shared with personal item)
Qantas	FitsFits	No published limit	5.3kg to pack (of 7kg shared with personal item)11.7lb to pack (of 15.4lb shared with personal item)
Qatar Airways	FitsFits	No published limit	5.3kg to pack (of 7kg)11.7lb to pack (of 15.4lb)
RyanairCabin bag not on every fare	FitsFits	Too bigToo big	8.3kg to pack (of 10kg)18.3lb to pack (of 22lb)
SAS	FitsFits	Too bigToo big	6.3kg to pack (of 8kg)13.9lb to pack (of 17.6lb)
Singapore Airlines	FitsFits	Too bigToo big	5.3kg to pack (of 7kg)11.7lb to pack (of 15.4lb)
Southwest Airlines	FitsFits	No published limit	No published limitNo published limit
Turkish Airlines	FitsFits	Too bigToo big	6.3kg to pack (of 8kg)13.9lb 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	5.3kg to pack (of 7kg shared with personal item)11.7lb to pack (of 15.4lb shared with personal item)
VolarisCabin bag not on every fare	FitsFits	FitsFits	8.3kg to pack (of 10kg)18.3lb to pack (of 22lb)
VuelingCabin bag not on every fare	FitsFits	Too bigToo big	8.3kg to pack (of 10kg)18.3lb 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	8.3kg to pack (of 10kg)18.3lb 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 1.72kg3.8lb. Limits and sources. Own a different bag? Check it against every airline.