---
url: "https://onebag.travel/compare/e5knzdtvc9/fjallraven-rucksack-no-21-medium/lgggqva3tj/aer-duffel-pack-2/"
title: "Fjallraven Rucksack No. 21 Medium vs Aer Duffel Pack 2"
description: "Fjallraven Rucksack No. 21 Medium vs Aer Duffel Pack 2: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/e5knzdtvc9/fjallraven-rucksack-no-21-medium/lgggqva3tj/aer-duffel-pack-2/"
---
1.  [Home](https://onebag.travel/)
2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  Fjallraven Rucksack No. 21 Medium vs. Aer Duffel Pack 2

# Fjallraven Rucksack No. 21 Medium vs. Aer Duffel Pack 2

Two carry-on travel backpacks, compared spec for spec.

## [Fjallraven Rucksack No. 21 Medium](https://onebag.travel/carryon/e5knzdtvc9/fjallraven-rucksack-no-21-medium/)

by [Fjallraven](https://onebag.travel/carryons/?brands=Fjallraven)

![Front facing view of the Fjallraven Rucksack No. 21 Medium](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1624459069/carryons/Fjallraven_Rucksack_No._21_Medium_jvbbap.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>20 L</td></tr><tr><td>Weight</td><td>0.96 kg</td></tr><tr><td>Dimensions</td><td>44×28×13 cm</td></tr><tr><td>Airline fit</td><td>96%</td></tr><tr><td>Price</td><td>$180</td></tr></tbody></table>

## Feature by feature

| Fjallraven Rucksack No. 21 Medium | Feature | Aer Duffel Pack 2 |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 3 | Opening | 0 |
| N | Passport | N |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| N | Hip Belt | N |
| Y | Sternum Strap | Y |
| Inside |
| 15in | Laptop | 15in |
| 1 | Main Compartments | 3 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2 | Water Bottle Holder | 1 |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>G-1000® HeavyDuty Eco: 65% polyester, 35% cotton</td><td>900D eco-dyed polyester exterior</td></tr></tbody></table>

## [Aer Duffel Pack 2](https://onebag.travel/carryon/lgggqva3tj/aer-duffel-pack-2/)

by [Aer](https://onebag.travel/carryons/?brands=Aer)

![Front facing view of the Aer Duffel Pack 2](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1618225092/carryons/Aer_Duffel_Pack_2_wphfg9.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>24.6 L</td></tr><tr><td>Weight</td><td>1.1 kg</td></tr><tr><td>Dimensions</td><td>55×30×20 cm</td></tr><tr><td>Airline fit</td><td>86%</td></tr><tr><td>Price</td><td>$136</td></tr></tbody></table>

## Key differences between the Fjallraven Rucksack No. 21 Medium and Aer Duffel Pack 2

-   **Opening:** Top flap on the Fjallraven Rucksack No. 21 Medium; Other on the Aer Duffel Pack 2.
-   **Main compartments:** 1 on the Fjallraven Rucksack No. 21 Medium; 3 on the Aer Duffel Pack 2.
-   **Water bottle pockets:** 2 on the Fjallraven Rucksack No. 21 Medium; 1 on the Aer Duffel Pack 2.

Both have: backpack straps, sternum strap, laptop sleeve, water resistant.

## Which airlines take each bag as a carry-on

We checked both bags against the carry-on size limits of 189 airlines. 163 accept both. 18 accept only the Fjallraven Rucksack No. 21 Medium, and 0 accept only the Aer Duffel Pack 2.

### Only the Fjallraven Rucksack No. 21 Medium fits

Air Niugini, Air Tahiti, American Eagle, Belavia, easyJet, Etihad Airways, Great Lakes Airlines, Gulf Air, Liat Airlines, Oman Air, Qatar Airways, Ravn Alaska, Regional Express, Royal Jordanian, Scoot, Tiger Airways, Virgin Australia, WestJet.

## Fjallraven Rucksack No. 21 Medium vs. Aer Duffel Pack 2: which should you pack?

The **Aer Duffel Pack 2** carries 4.600000000000001L more than the **Fjallraven Rucksack No. 21 Medium** (20L vs. 24.6L), while the **Fjallraven Rucksack No. 21 Medium** is the lighter pack at 0.96kg (vs. 1.1kg). For carry-on flexibility, the **Fjallraven Rucksack No. 21 Medium** fits 96% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Aer Duffel Pack 2; if you want to travel lighter, the Fjallraven Rucksack No. 21 Medium is the better call.