Travel backpack · carry-on

Aer Travel Pack 4 35L: size, weight and airline fit

The Aer Travel Pack 4 35L measures 21.5 x 13.5 x 9 in and fits the carry-on limit of 34 of 39 airlines. Too big for Ryanair, Emirates and others.

Listed outside size: 21.5 x 13.5 x 9 in

Listed outside size

21.5 x 13.5 x 9 in

about 54.5 x 34 x 23 cm · 3.9 lb (1.77 kg) · 35 L

Fits 34 of 39 airlines

See it on Aer's site

Prices change often. Sizes from aersf.com, checked October 29, 2026.

What to know before you buy

Aer lists 21.5 x 13.5 x 9 in (54.5 x 34 x 23 cm), 3.90 lb and 35 L for the standard Cordura version.
It replaces the Travel Pack 3, which Aer lists as discontinued.

Which airlines does it fit as a carry-on?

Airline	Carry-on limit	Verdict	Tightest side	Weight limit
ANA (All Nippon Airways)	55 x 40 x 25 cm	Fits	0.5 cm spare	10 kg (22 lb)
AirAsia	56 x 36 x 23 cm	Fits	exactly at the limit	7 kg (15 lb)
Japan Airlines (JAL)	55 x 40 x 25 cm	Fits	0.5 cm spare	10 kg (22 lb)
Singapore Airlines	115 cm total	Fits	3.5 cm spare	7 kg (15 lb)
Vietjet Air	56 x 36 x 23 cm	Fits	exactly at the limit	7 kg (15 lb)
Vietnam Airlines	56 x 36 x 23 cm	Fits	exactly at the limit	—
Aer Lingus	21.5 x 15.5 x 9.5 in	Fits	exactly at the limit	22 lb (10 kg)
Air France	21.7 x 13.8 x 9.9 in	Fits	0.2 in spare	26 lb (12 kg)
British Airways	22 x 18 x 10 in	Fits	0.5 in spare	—
Iberia	56 x 40 x 25 cm	Fits	1.5 cm spare	10 kg (22 lb)
Jet2	56 x 45 x 25 cm	Fits	1.5 cm spare	10 kg (22 lb)
KLM	55 x 35 x 25 cm	Fits	0.5 cm spare	12 kg (26 lb)
Lufthansa	55 x 40 x 23 cm	Fits	exactly at the limit	8 kg (18 lb)
Turkish Airlines	55 x 40 x 23 cm	Fits	exactly at the limit	8 kg (18 lb)
Wizz Air	55 x 40 x 23 cm	Fits	exactly at the limit	10 kg (22 lb)
easyJet	56 x 45 x 25 cm	Fits	1.5 cm spare	—
Avianca	55 x 35 x 25 cm	Fits	0.5 cm spare	10 kg (22 lb)
Copa Airlines	22 x 14 x 10 in	Fits	0.5 in spare	22 lb (10 kg)
LATAM Airlines	21.7 x 13.8 x 9.8 in	Fits	0.2 in spare	26 lb (12 kg)
Volaris	55 x 40 x 25 cm	Fits	0.5 cm spare	10 kg (22 lb)
Air Canada	21.5 x 15.5 x 9 in	Fits	exactly at the limit	—
Alaska Airlines	22 x 14 x 9 in	Fits	exactly at the limit	—
Allegiant Air	22 x 16 x 10 in	Fits	0.5 in spare	—
American Airlines	22 x 14 x 9 in	Fits	exactly at the limit	—
Breeze Airways	22 x 14 x 9 in	Fits	exactly at the limit	35 lb (15.9 kg)
Delta Air Lines	22 x 14 x 9 in	Fits	exactly at the limit	—
Frontier Airlines	24 x 16 x 10 in	Fits	1 in spare	35 lb (15.9 kg)
JetBlue	22 x 14 x 9 in	Fits	exactly at the limit	—
Porter Airlines	21.5 x 15.5 x 9 in	Fits	exactly at the limit	—
Southwest Airlines	24 x 16 x 10 in	Fits	1 in spare	—
United Airlines	22 x 14 x 9 in	Fits	exactly at the limit	—
WestJet	22 x 14 x 9 in	Fits	exactly at the limit	—
Jetstar	56 x 36 x 23 cm	Fits	exactly at the limit	7 kg (15 lb)
Qantas	22 x 14 x 9 in	Fits	exactly at the limit	15 lb (7 kg)
Ryanair	55 x 40 x 20 cm	Too big	3 cm over	10 kg (22 lb)
Vueling	55 x 40 x 20 cm	Too big	3 cm over	10 kg (22 lb)
Emirates	55 x 38 x 22 cm	Too big	1 cm over	7 kg (15 lb)
Qatar Airways	50 x 37 x 25 cm	Too big	4.5 cm over	7 kg (15 lb)
Air New Zealand	21 x 16 x 9 in	Too big	0.5 in over	15 lb (7 kg)

Compared side by side in the unit each airline publishes, largest side first. "Spare" is the room left on the tightest side.

Specs

Listed outside size	21.5 x 13.5 x 9 in (about 54.5 x 34 x 23 cm)
Includes wheels and handles?	Not stated by the maker
Linear size (L + W + H)	44 in (111.5 cm)
Empty weight	3.9 lb (1.77 kg)
Capacity	35 L
Type	Travel backpack
Brand	Aer

Questions people ask

What size is the Aer Travel Pack 4 35L?

The maker lists 21.5 x 13.5 x 9 in (about 54.5 x 34 x 23 cm).

Which airlines does the Aer Travel Pack 4 35L fit?

On paper it fits the carry-on limit of 34 of the 39 airlines we track that publish a size.

How much does the Aer Travel Pack 4 35L weigh?

3.9 lb (1.77 kg) empty.

Researched from the maker's published specifications, not measured by us. Listings change, so check the size on the product page before you buy.

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