---
url: "https://onebag.travel/compare/3m1t3p4dt2/rei-co-op-flash-pack-22/aqw7uasy9t/opposethis-invisible-backpack-3/"
title: "REI Co-op Flash Pack 22 vs OpposeThis Invisible Backpack 3"
description: "REI Co-op Flash Pack 22 vs OpposeThis Invisible Backpack 3: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/3m1t3p4dt2/rei-co-op-flash-pack-22/aqw7uasy9t/opposethis-invisible-backpack-3/"
---
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2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  REI Co-op Flash Pack 22 vs. OpposeThis Invisible Backpack 3

# REI Co-op Flash Pack 22 vs. OpposeThis Invisible Backpack 3

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

## [REI Co-op Flash Pack 22](https://onebag.travel/carryon/3m1t3p4dt2/rei-co-op-flash-pack-22/)

by [REI Co-op](https://onebag.travel/carryons/?brands=REI Co-op)

![Front facing view of the REI Co-op Flash Pack 22](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601122690/carryons/reiflash_qzkyi0.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>0.4 kg</td></tr><tr><td>Dimensions</td><td>48×28×20 cm</td></tr><tr><td>Airline fit</td><td>93%</td></tr><tr><td>Price</td><td>$60</td></tr></tbody></table>

## Feature by feature

| REI Co-op Flash Pack 22 | Feature | OpposeThis Invisible Backpack 3 |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 3 | Opening | 3 |
| top | Passport | top |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| Y | Hip Belt | N |
| removable | Sternum Strap | removable |
| Inside |
| 15in | Laptop | 15in |
| 3 | Main Compartments | 5 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | N |
| N | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>Recycled nylon (bluesign®;-approved)</td><td>800x600D lightweight waterproof nylon-polyester blend</td></tr></tbody></table>

## [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>

## Key differences between the REI Co-op Flash Pack 22 and OpposeThis Invisible Backpack 3

-   **Hip belt:** Yes on the REI Co-op Flash Pack 22; No on the OpposeThis Invisible Backpack 3.
-   **Main compartments:** 3 on the REI Co-op Flash Pack 22; 5 on the OpposeThis Invisible Backpack 3.
-   **Water bottle pockets:** 2, side on the REI Co-op Flash Pack 22; No on the OpposeThis Invisible Backpack 3.
-   **Water resistant:** No on the REI Co-op Flash Pack 22; Yes on the OpposeThis Invisible Backpack 3.

Both have: passport pocket, backpack straps, sternum strap, laptop sleeve.

## 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. 5 accept only the REI Co-op Flash Pack 22, and 0 accept only the OpposeThis Invisible Backpack 3.

### Only the REI Co-op Flash Pack 22 fits

Air Niugini, Cayman Airways, Great Lakes Airlines, Regional Express, Virgin Australia.

## REI Co-op Flash Pack 22 vs. OpposeThis Invisible Backpack 3: which should you pack?

The **OpposeThis Invisible Backpack 3** carries 1L more than the **REI Co-op Flash Pack 22** (22L vs. 23L), while the **REI Co-op Flash Pack 22** is the lighter pack at 0.4kg (vs. 0.9kg). For carry-on flexibility, the **REI Co-op Flash Pack 22** fits 93% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the OpposeThis Invisible Backpack 3; if you want to travel lighter, the REI Co-op Flash Pack 22 is the better call.