---
url: "https://onebag.travel/compare/69nfdrly0r/aer-fit-pack-3/e6sa9fxy4t/opposethis-invisible-two-2020/"
title: "Aer Fit Pack 3 vs OPPOSETHIS Invisible Two - 2020"
description: "Aer Fit Pack 3 vs OPPOSETHIS Invisible Two - 2020: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/69nfdrly0r/aer-fit-pack-3/e6sa9fxy4t/opposethis-invisible-two-2020/"
---
1.  [Home](https://onebag.travel/)
2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  Aer Fit Pack 3 vs. OPPOSETHIS Invisible Two - 2020

# Aer Fit Pack 3 vs. OPPOSETHIS Invisible Two - 2020

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

## [Aer Fit Pack 3](https://onebag.travel/carryon/69nfdrly0r/aer-fit-pack-3/)

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

![Front facing view of the Aer Fit Pack 3](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1620127600/carryons/Aer_Fit_Pack_3_inpmfs.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>18.7 L</td></tr><tr><td>Weight</td><td>0 kg</td></tr><tr><td>Dimensions</td><td>44×32×20 cm</td></tr><tr><td>Airline fit</td><td>95%</td></tr><tr><td>Price</td><td>$145</td></tr></tbody></table>

## Feature by feature

| Aer Fit Pack 3 | Feature | OPPOSETHIS Invisible Two - 2020 |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 4 | Opening | 4 |
| Y | Passport | N |
| Y | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| N | Hip Belt | N |
| Y | Sternum Strap | N |
| Inside |
| 16in | Laptop | 16in |
| 1 | Main Compartments | 1 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| optional | Rain-fly | N |
| 1 | Water Bottle Holder | 1 |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>1680D Cordura® ballistic nylon exterior</td><td>800x600D lightweight waterproof nylon-polyester blend</td></tr></tbody></table>

## [OPPOSETHIS Invisible Two - 2020](https://onebag.travel/carryon/e6sa9fxy4t/opposethis-invisible-two-2020/)

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

![Front facing view of the OPPOSETHIS Invisible Two - 2020](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1630895962/carryons/OPPOSETHIS_Invisible_Two_lboiuf.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>49×30×16 cm</td></tr><tr><td>Airline fit</td><td>92%</td></tr><tr><td>Price</td><td>$208</td></tr></tbody></table>

## Key differences between the Aer Fit Pack 3 and OPPOSETHIS Invisible Two - 2020

-   **Passport pocket:** Yes on the Aer Fit Pack 3; No on the OPPOSETHIS Invisible Two - 2020.
-   **Luggage passthrough:** Yes on the Aer Fit Pack 3; No on the OPPOSETHIS Invisible Two - 2020.
-   **Sternum strap:** Yes on the Aer Fit Pack 3; No on the OPPOSETHIS Invisible Two - 2020.
-   **Rain cover:** Optional on the Aer Fit Pack 3; No on the OPPOSETHIS Invisible Two - 2020.

Both have: backpack straps, laptop sleeve, water bottle pockets, water resistant.

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

We checked both bags against the carry-on size limits of 189 airlines. 172 accept both. 7 accept only the Aer Fit Pack 3, and 1 accept only the OPPOSETHIS Invisible Two - 2020.

### Only the Aer Fit Pack 3 fits

Air Tahiti, American Eagle, easyJet, Gulf Air, Ravn Alaska, Regional Express, Virgin Australia.

### Only the OPPOSETHIS Invisible Two - 2020 fits

Air Niugini.

## Aer Fit Pack 3 vs. OPPOSETHIS Invisible Two - 2020: which should you pack?

The **OPPOSETHIS Invisible Two - 2020** carries 4.300000000000001L more than the **Aer Fit Pack 3** (18.7L vs. 23L), and the two are closely matched on weight. For carry-on flexibility, the **Aer Fit Pack 3** fits 95% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the OPPOSETHIS Invisible Two - 2020; if you want to travel lighter, the OPPOSETHIS Invisible Two - 2020 is the better call.