---
url: "https://onebag.travel/compare/4ur3vo1zzw/rei-co-op-ruckpack-18/fp6w6mo3ab/millican-smith-18l/"
title: "REI Co-op Ruckpack 18 vs Millican Smith 18L - One Bag Travel"
description: "REI Co-op Ruckpack 18 vs Millican Smith 18L: 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/fp6w6mo3ab/millican-smith-18l/"
---
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2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  REI Co-op Ruckpack 18 vs. Millican Smith 18L

# REI Co-op Ruckpack 18 vs. Millican Smith 18L

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

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>210-denier nylon ripstop</td><td>Weatherproof Bionic Canvas</td></tr></tbody></table>

## [Millican Smith 18L](https://onebag.travel/carryon/fp6w6mo3ab/millican-smith-18l/)

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

![Front facing view of the Millican Smith 18L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601586503/carryons/mavericks-Smith-18l-slate-front_1024x_tzt5sd.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>0.9 kg</td></tr><tr><td>Dimensions</td><td>50×28×10 cm</td></tr><tr><td>Airline fit</td><td>92%</td></tr><tr><td>Price</td><td>$130</td></tr></tbody></table>

## Key differences between the REI Co-op Ruckpack 18 and Millican Smith 18L

-   **Opening:** Other on the REI Co-op Ruckpack 18; Rolltop on the Millican Smith 18L.
-   **Main compartments:** 2 on the REI Co-op Ruckpack 18; 3 on the Millican Smith 18L.
-   **Built-in organizer:** Yes on the REI Co-op Ruckpack 18; No on the Millican Smith 18L.

Both have: passport pocket, hip belt, sternum strap, laptop sleeve, water resistant.

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

We checked both bags against the carry-on size limits of 189 airlines. 174 accept both. 7 accept only the REI Co-op Ruckpack 18, and 0 accept only the Millican Smith 18L.

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

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

## REI Co-op Ruckpack 18 vs. Millican Smith 18L: which should you pack?

The **REI Co-op Ruckpack 18** carries the same capacity as the **Millican Smith 18L** (18L vs. 18L), 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 REI Co-op Ruckpack 18; if you want to travel lighter, the REI Co-op Ruckpack 18 is the better call.