Sizeproof
CabinZero · carry-on

Does the CabinZero Classic Backpack 44L fit as a carry-on?

By its listed size it fits 18 of 38 airlines that publish a carry-on limit and is too big for 20.

Size and specs

Listed size55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in)
Volume44 L
Empty weight1.7 lb (0.8 kg)
Laptop sleeveup to 17 in
Wheelsnone
The brand doesn't say whether this is the outside size.

Against the usual US limit

05101520in FrontSide

Dashed and yellow: American Airlines' carry-on limit, 22 × 14 × 9 in. Coloured: this bag's listed size.

Every airline

Airlinecarry-on limitThis bag
United States
Alaska Airlines22 × 14 × 9 in (56 × 36 × 23 cm)Too big 1.7 in over, too wide
Allegiant Air10 × 16 × 22 in (25 × 41 × 56 cm)Fits 0.3 in to spare
American Airlines22 × 14 × 9 in (56 × 36 × 23 cm)Too big 1.7 in over, too wide
Avelo Airlines22 × 14 × 9 in (56 × 36 × 23 cm)Too big 1.7 in over, too wide
Breeze Airways22 × 14 × 9 in (56 × 36 × 23 cm)Too big 1.7 in over, too wide
Delta Air Lines22 × 14 × 9 in (56 × 36 × 23 cm)Too big 1.7 in over, too wide
Frontier Airlines24 × 16 × 10 in (61 × 41 × 25 cm)Fits 0.3 in to spare
Hawaiian Airlines22 × 14 × 9 in (56 × 36 × 23 cm)Too big 1.7 in over, too wide
JetBlue22 × 14 × 9 in (56 × 36 × 23 cm)Too big 1.7 in over, too wide
Southwest Airlines24 × 16 × 10 in (61 × 41 × 25 cm)Fits 0.3 in to spare
Sun Country Airlines24 × 16 × 11 in (61 × 41 × 28 cm)Fits 0.3 in to spare
United Airlines9 × 14 × 22 in (23 × 36 × 56 cm)Too big 1.7 in over, too wide
Canada & Mexico
Aeromexico55 × 40 × 25 cm (21.7 × 15.7 × 9.8 in)Fits right at the limit
Air Canada9 × 15.5 × 21.5 in (23 × 39 × 55 cm)Too big 0.2 in over, too wide
Porter Airlines21.5 × 15.5 × 9 in (55 × 39 × 23 cm)Too big 0.2 in over, too wide
Viva Aerobus22 × 16 × 10 in (56 × 41 × 25 cm)Fits 0.3 in to spare
Volaris55 × 40 × 25 cm (21.7 × 15.7 × 9.8 in)Fits right at the limit
WestJet22 × 14 × 9 in (56 × 36 × 23 cm)Too big 1.7 in over, too wide
Latin America
Avianca55 × 35 × 25 cm (21.7 × 13.8 × 9.8 in)Too big 2 in over, too wide
Copa Airlines56 × 36 × 26 cm (22 × 14.2 × 10.2 in)Too big 1.6 in over, too wide
LATAM Airlines55 × 35 × 25 cm (21.7 × 13.8 × 9.8 in)Too big 2 in over, too wide
Europe
Aer Lingus55 × 40 × 24 cm (21.7 × 15.7 × 9.4 in)Fits right at the limit
Air France55 × 35 × 25 cm (21.7 × 13.8 × 9.8 in)Too big 2 in over, too wide
British Airways56 × 45 × 25 cm (22 × 17.7 × 9.8 in)Fits 0.4 in to spare
easyJet56 × 45 × 25 cm (22 × 17.7 × 9.8 in)Fits 0.4 in to spare
Iberia56 × 40 × 25 cm (22 × 15.7 × 9.8 in)Fits right at the limit
Icelandair55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in)Fits right at the limit
KLM55 × 35 × 25 cm (21.7 × 13.8 × 9.8 in)Too big 2 in over, too wide
Lufthansa55 × 40 × 23 cm (21.7 × 15.7 × 9.1 in)Fits right at the limit
Ryanair55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in)Fits right at the limit
Turkish Airlines23 × 40 × 55 cm (9.1 × 15.7 × 21.7 in)Fits right at the limit
Virgin Atlantic23 × 36 × 56 cm (9.1 × 14.2 × 22 in)Too big 1.6 in over, too wide
Vueling55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in)Fits right at the limit
Wizz Air55 × 40 × 23 cm (21.7 × 15.7 × 9.1 in)Fits right at the limit
Middle East & Asia-Pacific
Emirates55 × 38 × 22 cm (21.7 × 15 × 8.7 in)Too big 0.8 in over, too wide
Japan Airlines55 × 40 × 25 cm (21.7 × 15.7 × 9.8 in)Fits right at the limit
Qantas56 × 36 × 23 cm (22 × 14.2 × 9.1 in)Too big 1.6 in over, too wide
Qatar Airways50 × 37 × 25 cm (19.7 × 14.6 × 9.8 in)Too big 2 in over, too tall

"Borderline" means over by no more than the rounding in published sizes (0.5 cm, about 0.2 in). It may pass at the gate, but we don't promise it.

Where these numbers come from

Notes from our data check

Brand spec: 'Weight 760 g / 1 lb 11 oz | Capacity 44L | Dimensions 51 x 36 x 18 cm | 20.1 x 14.2 x 7.1 in'; 'The Classic Backpack 44L measures 51 x 36 x 18 cm and meets the carry-on size limits of 91 airlines'. 1 lb 11 oz = 1.69 lb. CONFLICTS: (1) laptop 'Fits 17-inch laptop' in the features vs 'Devices Up to 18 inches' in the spec (Amazon also says 18); 17 stored. (2) Older listings and reviews quote 55 x 40 x 20 cm, and a 2026 review on the brand page says the 44L bags received measured 55 x 40 x 20 cm, not 51 x 36 x 18. Treat the size as uncertain until measured. (3) An Amazon listing title says 36x51x19. 14.2 in wide is over a 14 in limit. PRICE: cabinzero.com shows GBP 65; no US list price was found (Amazon B07L8GQTVV, Black Sand, showed $129.72 with 1 left, which looks like a third-party price), so priceUsd is null. The Amazon listing matches the brand size (20.1 x 14.2 x 7.1 in, 760 g); 4.6 stars from 449 ratings. A 36L (45 x 31 x 20 cm, 700 g, 15.6" laptop) also exists. Sizes conflict: the brand page now says 51 x 36 x 18 cm, but the bag is sold as a 55 x 40 x 20 cm cabin bag, a buyer on the brand page measured that, and 44 L only fits the larger size. We use the larger size so we never call it a fit when it might not be.