---
url: "https://onebag.travel/compare/4ur3vo1zzw/rei-co-op-ruckpack-18/gpfbufuba2/osprey-flapjack/"
title: "REI Co-op Ruckpack 18 vs Osprey Flapjack - One Bag Travel"
description: "REI Co-op Ruckpack 18 vs Osprey Flapjack: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/4ur3vo1zzw/rei-co-op-ruckpack-18/gpfbufuba2/osprey-flapjack/"
---
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2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  REI Co-op Ruckpack 18 vs. Osprey Flapjack

# REI Co-op Ruckpack 18 vs. Osprey Flapjack

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

## [REI Co-op Ruckpack 18](https://onebag.travel/carryon/4ur3vo1zzw/rei-co-op-ruckpack-18/)

![Front facing view of the REI Co-op Ruckpack 18](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601601381/carryons/reirutpack_nq5156.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>18 L</td></tr><tr><td>Weight</td><td>0.7 kg</td></tr><tr><td>Dimensions</td><td>44×26×18 cm</td></tr><tr><td>Airline fit</td><td>96%</td></tr><tr><td>Price</td><td>$65</td></tr></tbody></table>

## Feature by feature

| REI Co-op Ruckpack 18 | Feature | Osprey Flapjack |
| --- | --- | --- |
| Storage |
|  | Compression |  |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| side | Passport | side |
| N | Passthrough | N |
| Carry |
|  | Backpack | Y |
| removable | Hip Belt | removable |
| removable | Sternum Strap |  |
| Inside |
| 15in | Laptop | 15in |
| 2 | Main Compartments | 3 |
| Y | Organizer | Y |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
|  | Water Bottle Holder |  |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>210-denier nylon ripstop</td><td>600D Polyspun</td></tr></tbody></table>

## [Osprey Flapjack](https://onebag.travel/carryon/gpfbufuba2/osprey-flapjack/)

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

![Front facing view of the Osprey Flapjack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601576342/carryons/c9e6c91c-b836-4c78-a9ed-c452b3ce9d5a_rsb3j2.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>21 L</td></tr><tr><td>Weight</td><td>0.9 kg</td></tr><tr><td>Dimensions</td><td>49×34×23 cm</td></tr><tr><td>Airline fit</td><td>72%</td></tr><tr><td>Price</td><td>$110</td></tr></tbody></table>

## Key differences between the REI Co-op Ruckpack 18 and Osprey Flapjack

-   **Main compartments:** 2 on the REI Co-op Ruckpack 18; 3 on the Osprey Flapjack.

Both have: passport pocket, hip belt, laptop sleeve, built-in organizer, water resistant.

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

We checked both bags against the carry-on size limits of 189 airlines. 136 accept both. 45 accept only the REI Co-op Ruckpack 18, and 0 accept only the Osprey Flapjack.

### Only the REI Co-op Ruckpack 18 fits

Air Baltic, Air China, Air Malta, Air Niugini, Air Serbia, Air Seychelles, Air Tahiti, American Eagle, Asiana Airlines, ATA Airlines, Belavia, Blue Air, Bulgaria Air, China Eastern, easyJet, Emirates Airlines, Enter Air, flybe, Great Lakes Airlines, Gulf Air, Icelandair, InselAir, Juneyao Airlines, Liat Airlines, Luxair, Meridiana Fly, Nordwind Airlines, Pakistan International, Ravn Alaska, Regional Express, Royal Brunei Airlines, Ryanair, S7, Shandong Airlines, Shenzhen Airlines, Sun Express, TAP Air Portugal, TAROM, Tianjin Airlines (A320 & E190), TUI, Ukraine International, VIM Airlines (Closed), Virgin Australia, Volotea, Xiamen.

## REI Co-op Ruckpack 18 vs. Osprey Flapjack: which should you pack?

The **Osprey Flapjack** carries 3L more than the **REI Co-op Ruckpack 18** (18L vs. 21L), while the **REI Co-op Ruckpack 18** is the lighter pack at 0.7kg (vs. 0.9kg). For carry-on flexibility, the **REI Co-op Ruckpack 18** fits 96% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Osprey Flapjack; if you want to travel lighter, the REI Co-op Ruckpack 18 is the better call.