Can a 40L backpack be a personal item on Air Canada?

A 40L backpack falls in carry-on territory on Air Canada. The published limit is 55 × 40 × 23 cm. Whether a specific 40L backpack stays inside that limit depends on the bag's external measurements and packed weight.

What is Air Canada's weight limit on international flights?

Air Canada's weight limit is 10 kg on international routes. A 40L backpack is borderline — dimensions typically clear, but a laptop, tech kit, and standard packing can push past the weight ceiling.

Can I bring a 40L backpack and a personal item on Air Canada?

Yes. Air Canada allows one carry-on and one personal item. A 40L backpack typically counts as a carry-on, while a smaller bag fits under the seat.

Air Canada Carry-On Rules — What Actually Fits (and What Hits the Weight Limit)

Will a 40L Backpack Fit on Air Canada?

Q: Will a 40L backpack fit on Air Canada?

It depends on packing. A 40L backpack is borderline for Air Canada's carry-on limit of 55 × 40 × 23 cm — dimensions are usually fine, but the 10 kg weight limit on international routes is the constraint that most 40L packers hit first.

A 40L backpack can work as carry-on on Air Canada, but at 55 × 40 × 23 cm (21.7 × 15.7 × 9 in) limits, height becomes the constraint when the bag is fully loaded.

Two things decide it: packed external dimensions (depth is the variable) and packed weight. A laptop, tech kit, and heavy packing style can push past the 10 kg limit.

Placement: Borderline Carry-On (Overhead Bin) Confidence: Medium Best For: 3–7 Day Trips

Last updated: March 2026

Air Canada's carry-on limit is 55 × 40 × 23 cm (21.7 × 15.7 × 9 in). A 40L backpack generally works at this size, provided the bag's external dimensions stay controlled when packed. The 10 kg weight limit on international routes is the real constraint — a laptop, tech kit, and heavy packing style can push past it. Carry-on allowances vary by ticket type — stricter size limits are commonly enforced.

Check if this will actually fit your trip →

Will This Bag Actually Work for Your Trip?

Your result depends on what you pack, not just the bag size.

Trip Setup

Trip Length

Climate

Packing Profile

Laundry Access

Gear & Footwear

Gear

Laptop Bulky Layer

Extra Packed Shoes

Bag & Airline

Bag Type

Bag Size

What do these bag sizes mean? (in liters)

Under 25L — Personal item range (fits under the seat)
30–35L — Small carry-on for short trips
35–40L — Standard carry-on range (most common)
40–45L — Borderline carry-on (packing-dependent)
45L+ — Exceeds carry-on limits in most cases

See full guide: carry-on size in liters

Airline

Add personal item (up to ~25L)

Use this if you plan to bring a second under-seat item like a daypack, tote, or laptop bag.

Traveler

Clothing Size

Based on real clothing volumes and packing behavior

Gear

Recommended Bags for This Trip

These recommendations are based on real bag dimensions compared to Air Canada carry-on limits, plus how well each bag fits a 40-liter packing load.

Packing Reality Check

When Does a 40L Bag Work on Air Canada?

Works Well

4–7 day trips
Light or standard packing
Warm or mild climate
Laundry available
No extra shoes
Soft-sided bag design

Risk Factors

5+ days without laundry
Cold weather gear
Heavy packing style
Laptop and full tech kit
Extra shoes packed
Larger clothing sizes

Published Carry-On Limits

Air Canada Carry-On Rules

Max dimensions	55 × 40 × 23 cm (21.5 × 15.5 × 9 in)
Weight limit	10 kg (22 lbs) — enforced on international routes
Personal item	Yes — one personal item allowed (under seat)
Carry-on access	Included on most fares
Fit at 40L	A 40L backpack is borderline — dimensions are usually fine, but the 10 kg weight limit is the real constraint

At 40L, most soft-sided carry-on packs clear Air Canada's dimension box. The depth (23 cm / 9 in) is tight for overpacked bags. The 10 kg weight limit is the more frequent constraint — heavy packers with laptops and tech gear hit it well before running out of volume.

For a full breakdown of size limits, boarding rules, and exceptions, see our airline carry-on rules guide →

Bottom Line

A 40L bag clears Air Canada's carry-on dimensions in most standard setups — the depth (23 cm) is the dimension to watch
The 10 kg weight limit on international routes is the real constraint — plan around weight, not just volume
Overpacked or rigid-frame bags can push past either limit
Use the calculator above to check your specific trip setup

Other bag sizes on Air Canada

Will a 30L backpack fit on Air Canada? →

Same size on other airlines

Will a 40L backpack fit on Delta? →

Will a 40L backpack fit on United? →

Will a 40L backpack fit on American? →

Will a 40L backpack fit on Southwest? →

Will a 40L backpack fit on Ryanair? →

Will a 40L backpack fit on EasyJet? →

Packing guides

What to pack for a 3-day trip →

What to pack for a 5-day trip →

What to pack for a 7-day trip →

What to pack for a 10-day trip →

What to pack for a 14-day trip →

Not sure if it'll all fit? Try the packing calculator →

Notes

How Accurate Is This?

This tool reflects real-world packing conditions, not just theoretical bag sizes. Results are based on typical clothing volumes, packing efficiency, and common travel setups.

Airline limits are based on external bag dimensions, not listed volume. A 30L backpack clears most carry-on size boxes easily — whether it doubles as a personal item depends on its packed profile and the aircraft's under-seat clearance.

This is a planning tool, not a guarantee. Airline staff make the final call — packed shape, bag rigidity, and gate-day enforcement all play a role.

This analysis is based on real packing volumes, airline dimension limits, and how soft-sided bags behave when packed.