---
url: "https://onebag.travel/compare/5uozk4l5zy/ks-ultralight-ks27/877l9d0o0i/5-11-rush-12/"
title: "KS Ultralight KS27 vs 5.11 Rush 12 - One Bag Travel"
description: "KS Ultralight KS27 vs 5.11 Rush 12: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/5uozk4l5zy/ks-ultralight-ks27/877l9d0o0i/5-11-rush-12/"
---
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3.  KS Ultralight KS27 vs. 5.11 Rush 12

# KS Ultralight KS27 vs. 5.11 Rush 12

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

## [KS Ultralight KS27](https://onebag.travel/carryon/5uozk4l5zy/ks-ultralight-ks27/)

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

![Front facing view of the KS Ultralight KS27](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990375/carryons/ks-ultralight-ks27-5uozk4l5zy.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>27 L</td></tr><tr><td>Weight</td><td>0.3 kg</td></tr><tr><td>Dimensions</td><td>55×28×16 cm</td></tr><tr><td>Airline fit</td><td>87%</td></tr><tr><td>Price</td><td>$130</td></tr></tbody></table>

## Feature by feature

| KS Ultralight KS27 | Feature | 5.11 Rush 12 |
| --- | --- | --- |
| Storage |
| 2 | Compression | 2 |
| None | Expanded Capacity | None |
| 0 | Opening | 1 |
| top | Passport | top |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| removable | Hip Belt | removable |
| removable | Sternum Strap | removable |
| Inside |
| N | Laptop | N |
| 2 | Main Compartments | 4 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | N |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>X-pac VX 07 YKK "waterproof zip"</td><td>Water-resistant 1050D nylon</td></tr></tbody></table>

## [5.11 Rush 12](https://onebag.travel/carryon/877l9d0o0i/5-11-rush-12/)

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

![Front facing view of the 5.11 Rush 12](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/carryons/l26eeyqiuk8signvcmpg)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>24 L</td></tr><tr><td>Weight</td><td>1.2 kg</td></tr><tr><td>Dimensions</td><td>46×28×17 cm</td></tr><tr><td>Airline fit</td><td>95%</td></tr><tr><td>Price</td><td>$105</td></tr></tbody></table>

## Key differences between the KS Ultralight KS27 and 5.11 Rush 12

-   **Opening:** Other on the KS Ultralight KS27; Clamshell on the 5.11 Rush 12.
-   **Main compartments:** 2 on the KS Ultralight KS27; 4 on the 5.11 Rush 12.
-   **Water bottle pockets:** 2, side on the KS Ultralight KS27; No on the 5.11 Rush 12.

Both have: compression straps, passport pocket, backpack straps, hip belt, sternum strap, water resistant.

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

We checked both bags against the carry-on size limits of 189 airlines. 164 accept both. 0 accept only the KS Ultralight KS27, and 15 accept only the 5.11 Rush 12.

### Only the 5.11 Rush 12 fits

Air Niugini, American Eagle, Belavia, easyJet, Etihad Airways, Liat Airlines, Oman Air, Qatar Airways, Ravn Alaska, Regional Express, Royal Jordanian, Scoot, Tiger Airways, Virgin Australia, WestJet.

## KS Ultralight KS27 vs. 5.11 Rush 12: which should you pack?

The **KS Ultralight KS27** carries 3L more than the **5.11 Rush 12** (27L vs. 24L), while the **KS Ultralight KS27** is the lighter pack at 0.3kg (vs. 1.2kg). For carry-on flexibility, the **5.11 Rush 12** fits 95% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the KS Ultralight KS27; if you want to travel lighter, the KS Ultralight KS27 is the better call.