---
url: "https://onebag.travel/compare/q54m3y57hp/5-11-skyweight-36l-pack/yshyt43faw/rei-co-op-trail-40/"
title: "5.11 Skyweight 36L Pack vs REI Co-op Trail 40"
description: "5.11 Skyweight 36L Pack vs REI Co-op Trail 40: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/q54m3y57hp/5-11-skyweight-36l-pack/yshyt43faw/rei-co-op-trail-40/"
---
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3.  5.11 Skyweight 36L Pack vs. REI Co-op Trail 40

# 5.11 Skyweight 36L Pack vs. REI Co-op Trail 40

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

## [5.11 Skyweight 36L Pack](https://onebag.travel/carryon/q54m3y57hp/5-11-skyweight-36l-pack/)

by [5.11](https://onebag.travel/carryons/?brands=5.11)

![Front facing view of the 5.11 Skyweight 36L Pack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990315/carryons/5-11-skyweight-36l-pack-q54m3y57hp.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>36 L</td></tr><tr><td>Weight</td><td>1.1 kg</td></tr><tr><td>Dimensions</td><td>56×33×22 cm</td></tr><tr><td>Airline fit</td><td>47%</td></tr><tr><td>Price</td><td>$200</td></tr></tbody></table>

## Feature by feature

| 5.11 Skyweight 36L Pack | Feature | REI Co-op Trail 40 |
| --- | --- | --- |
| Storage |
| 4 | Compression | 4 |
| None | Expanded Capacity | None |
| 1 | Opening | 1 |
| top | Passport | top |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| removable | Hip Belt | Y |
| Y | Sternum Strap | removable |
| Inside |
| N | Laptop | N |
| 4 | Main Compartments | 5 |
| N | Organizer | Y |
| Outside |
| × | Hard Shell | × |
| Y | Rain-fly | Y |
| 2, side | Water Bottle Holder | 2, side |
| N | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>330D ripstop nylon</td><td>210-denier ripstop nylon</td></tr></tbody></table>

## [REI Co-op Trail 40](https://onebag.travel/carryon/yshyt43faw/rei-co-op-trail-40/)

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

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>40 L</td></tr><tr><td>Weight</td><td>1.2 kg</td></tr><tr><td>Dimensions</td><td>56×30×23 cm</td></tr><tr><td>Airline fit</td><td>47%</td></tr><tr><td>Price</td><td>$130</td></tr></tbody></table>

## Key differences between the 5.11 Skyweight 36L Pack and REI Co-op Trail 40

-   **Hip belt:** Removable on the 5.11 Skyweight 36L Pack; Yes on the REI Co-op Trail 40.
-   **Sternum strap:** Yes on the 5.11 Skyweight 36L Pack; Removable on the REI Co-op Trail 40.
-   **Main compartments:** 4 on the 5.11 Skyweight 36L Pack; 5 on the REI Co-op Trail 40.
-   **Built-in organizer:** No on the 5.11 Skyweight 36L Pack; Yes on the REI Co-op Trail 40.
-   **Water resistant:** No on the 5.11 Skyweight 36L Pack; Yes on the REI Co-op Trail 40.

Both have: compression straps, passport pocket, backpack straps, rain cover, water bottle pockets.

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

We checked both bags against the carry-on size limits of 189 airlines. 88 accept both. Every airline that takes one takes the other.

## 5.11 Skyweight 36L Pack vs. REI Co-op Trail 40: which should you pack?

The **REI Co-op Trail 40** carries 4L more than the **5.11 Skyweight 36L Pack** (36L vs. 40L), while the **5.11 Skyweight 36L Pack** is the lighter pack at 1.1kg (vs. 1.2kg). For carry-on flexibility, the **5.11 Skyweight 36L Pack** fits 47% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the REI Co-op Trail 40; if you want to travel lighter, the 5.11 Skyweight 36L Pack is the better call.