---
url: "https://onebag.travel/compare/e5knzdtvc9/fjallraven-rucksack-no-21-medium/ejp4u65swx/boundary-supply-errant-x-pac/"
title: "Fjallraven Rucksack No. 21 Medium vs Boundary Supply Errant X-Pac"
description: "Fjallraven Rucksack No. 21 Medium vs Boundary Supply Errant X-Pac: 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/ejp4u65swx/boundary-supply-errant-x-pac/"
---
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3.  Fjallraven Rucksack No. 21 Medium vs. Boundary Supply Errant X-Pac

# Fjallraven Rucksack No. 21 Medium vs. Boundary Supply Errant X-Pac

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 | Boundary Supply Errant X-Pac |
| --- | --- | --- |
| Storage |
| N | Compression | Y |
| None | Expanded Capacity | None |
| 3 | Opening | 3 |
| N | Passport | N |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| N | Hip Belt | N |
| Y | Sternum Strap | Y |
| Inside |
| 15in | Laptop | 17in |
| 1 | Main Compartments | 1 |
| 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>X-Pac</td></tr></tbody></table>

## [Boundary Supply Errant X-Pac](https://onebag.travel/carryon/ejp4u65swx/boundary-supply-errant-x-pac/)

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

![Front facing view of the Boundary Supply Errant X-Pac](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1620709756/carryons/Boundary_Supply_X-Pac_vfjtoh.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>22 L</td></tr><tr><td>Weight</td><td>1.4 kg</td></tr><tr><td>Dimensions</td><td>48×29×14 cm</td></tr><tr><td>Airline fit</td><td>93%</td></tr><tr><td>Price</td><td>$250</td></tr></tbody></table>

## Key differences between the Fjallraven Rucksack No. 21 Medium and Boundary Supply Errant X-Pac

-   **Compression straps:** No on the Fjallraven Rucksack No. 21 Medium; Yes on the Boundary Supply Errant X-Pac.
-   **Laptop sleeve:** 15in on the Fjallraven Rucksack No. 21 Medium; 17in on the Boundary Supply Errant X-Pac.
-   **Water bottle pockets:** 2 on the Fjallraven Rucksack No. 21 Medium; 1 on the Boundary Supply Errant X-Pac.

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

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

We checked both bags against the carry-on size limits of 189 airlines. 175 accept both. 6 accept only the Fjallraven Rucksack No. 21 Medium, and 0 accept only the Boundary Supply Errant X-Pac.

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

Air Tahiti, American Eagle, easyJet, Great Lakes Airlines, Gulf Air, Ravn Alaska.

## Fjallraven Rucksack No. 21 Medium vs. Boundary Supply Errant X-Pac: which should you pack?

The **Boundary Supply Errant X-Pac** carries 2L more than the **Fjallraven Rucksack No. 21 Medium** (20L vs. 22L), while the **Fjallraven Rucksack No. 21 Medium** is the lighter pack at 0.96kg (vs. 1.4kg). 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 Boundary Supply Errant X-Pac; if you want to travel lighter, the Fjallraven Rucksack No. 21 Medium is the better call.