---
url: "https://onebag.travel/compare/4ur3vo1zzw/rei-co-op-ruckpack-18/6audg2ttt0/millican-smith-25l/"
title: "REI Co-op Ruckpack 18 vs Millican Smith 25L - One Bag Travel"
description: "REI Co-op Ruckpack 18 vs Millican Smith 25L: 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-18/6audg2ttt0/millican-smith-25l/"
---
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3.  REI Co-op Ruckpack 18 vs. Millican Smith 25L

# REI Co-op Ruckpack 18 vs. Millican Smith 25L

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 25L |
| --- | --- | --- |
| 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 | 4 |
| Y | Organizer | Y |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
|  | Water Bottle Holder | 2, side |
| 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 25L](https://onebag.travel/carryon/6audg2ttt0/millican-smith-25l/)

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

![Front facing view of the Millican Smith 25L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/carryons/wfnvkqv7ixdgiesryrrj)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>25 L</td></tr><tr><td>Weight</td><td>1.1 kg</td></tr><tr><td>Dimensions</td><td>52×28×18 cm</td></tr><tr><td>Airline fit</td><td>89%</td></tr><tr><td>Price</td><td>$145</td></tr></tbody></table>

## Key differences between the REI Co-op Ruckpack 18 and Millican Smith 25L

-   **Opening:** Other on the REI Co-op Ruckpack 18; Rolltop on the Millican Smith 25L.
-   **Main compartments:** 2 on the REI Co-op Ruckpack 18; 4 on the Millican Smith 25L.

Both have: passport pocket, hip belt, sternum strap, 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. 168 accept both. 13 accept only the REI Co-op Ruckpack 18, and 0 accept only the Millican Smith 25L.

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

Air Niugini, Air Tahiti, American Eagle, Belavia, easyJet, Etihad Airways, Gulf Air, Oman Air, Qatar Airways, Ravn Alaska, Regional Express, Royal Jordanian, Virgin Australia.

## REI Co-op Ruckpack 18 vs. Millican Smith 25L: which should you pack?

The **Millican Smith 25L** carries 7L more than the **REI Co-op Ruckpack 18** (18L vs. 25L), while the **REI Co-op Ruckpack 18** is the lighter pack at 0.7kg (vs. 1.1kg). 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 Millican Smith 25L; if you want to travel lighter, the REI Co-op Ruckpack 18 is the better call.