---
url: "https://onebag.travel/compare/aqw7uasy9t/opposethis-invisible-backpack-3/m0gizsp8la/black-ember-citadel-r3-25/"
title: "OpposeThis Invisible Backpack 3 vs Black Ember Citadel R3 25"
description: "OpposeThis Invisible Backpack 3 vs Black Ember Citadel R3 25: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/aqw7uasy9t/opposethis-invisible-backpack-3/m0gizsp8la/black-ember-citadel-r3-25/"
---
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3.  OpposeThis Invisible Backpack 3 vs. Black Ember Citadel R3 25

# OpposeThis Invisible Backpack 3 vs. Black Ember Citadel R3 25

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

## [OpposeThis Invisible Backpack 3](https://onebag.travel/carryon/aqw7uasy9t/opposethis-invisible-backpack-3/)

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

![Front facing view of the OpposeThis Invisible Backpack 3](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601587752/carryons/Th2_2048x2048_llg2gz.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>23 L</td></tr><tr><td>Weight</td><td>0.9 kg</td></tr><tr><td>Dimensions</td><td>49×35×19 cm</td></tr><tr><td>Airline fit</td><td>90%</td></tr><tr><td>Price</td><td>$250</td></tr></tbody></table>

## Feature by feature

| OpposeThis Invisible Backpack 3 | Feature | Black Ember Citadel R3 25 |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 3 | Opening | 1 |
| top | Passport | top |
| N | Passthrough | Y |
| Carry |
| Y | Backpack | Y |
| N | Hip Belt | N |
| removable | Sternum Strap | removable |
| Inside |
| 15in | Laptop | 14in |
| 5 | Main Compartments | 4 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| N | Water Bottle Holder | N |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>800x600D lightweight waterproof nylon-polyester blend</td><td>421 VELOCITY CORDURA re/cor RN66</td></tr></tbody></table>

## [Black Ember Citadel R3 25](https://onebag.travel/carryon/m0gizsp8la/black-ember-citadel-r3-25/)

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

![Front facing view of the Black Ember Citadel R3 25](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990475/carryons/black-ember-citadel-r3-25-m0gizsp8la.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>25 L</td></tr><tr><td>Weight</td><td>1.6 kg</td></tr><tr><td>Dimensions</td><td>50×31×18 cm</td></tr><tr><td>Airline fit</td><td>91%</td></tr><tr><td>Price</td><td>$280</td></tr></tbody></table>

## Key differences between the OpposeThis Invisible Backpack 3 and Black Ember Citadel R3 25

-   **Opening:** Top flap on the OpposeThis Invisible Backpack 3; Clamshell on the Black Ember Citadel R3 25.
-   **Luggage passthrough:** No on the OpposeThis Invisible Backpack 3; Yes on the Black Ember Citadel R3 25.
-   **Laptop sleeve:** 15in on the OpposeThis Invisible Backpack 3; 14in on the Black Ember Citadel R3 25.
-   **Main compartments:** 5 on the OpposeThis Invisible Backpack 3; 4 on the Black Ember Citadel R3 25.

Both have: passport pocket, 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. 171 accept both. 0 accept only the OpposeThis Invisible Backpack 3, and 1 accept only the Black Ember Citadel R3 25.

### Only the Black Ember Citadel R3 25 fits

Cayman Airways.

## OpposeThis Invisible Backpack 3 vs. Black Ember Citadel R3 25: which should you pack?

The **Black Ember Citadel R3 25** carries 2L more than the **OpposeThis Invisible Backpack 3** (23L vs. 25L), while the **OpposeThis Invisible Backpack 3** is the lighter pack at 0.9kg (vs. 1.6kg). For carry-on flexibility, the **Black Ember Citadel R3 25** fits 91% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Black Ember Citadel R3 25; if you want to travel lighter, the OpposeThis Invisible Backpack 3 is the better call.