---
url: "https://onebag.travel/compare/5uozk4l5zy/ks-ultralight-ks27/g9gkqqi9n3/tom-bihn-aeronaut-30l/"
title: "KS Ultralight KS27 vs Tom Bihn Aeronaut 30L - One Bag Travel"
description: "KS Ultralight KS27 vs Tom Bihn Aeronaut 30L: 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/g9gkqqi9n3/tom-bihn-aeronaut-30l/"
---
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3.  KS Ultralight KS27 vs. Tom Bihn Aeronaut 30L

# KS Ultralight KS27 vs. Tom Bihn Aeronaut 30L

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 | Tom Bihn Aeronaut 30L |
| --- | --- | --- |
| Storage |
| 2 | Compression | N |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| top | Passport | side |
| N | Passthrough | N |
| Carry |
| Y | Backpack | hideable |
| removable | Hip Belt | removable |
| removable | Sternum Strap | removable |
| Inside |
| N | Laptop | N |
| 2 | Main Compartments | 5 |
| 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>1050 denier ballistic nylon OR ultralight 400d Halcyon/420d nylon ripstop 200 denier Halcyon/nylon ripstop fabric lining</td></tr></tbody></table>

## [Tom Bihn Aeronaut 30L](https://onebag.travel/carryon/g9gkqqi9n3/tom-bihn-aeronaut-30l/)

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

![Front facing view of the Tom Bihn Aeronaut 30L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601600830/carryons/aeronaut30_gvxzea.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>30 L</td></tr><tr><td>Weight</td><td>1.3 kg</td></tr><tr><td>Dimensions</td><td>50×32×20 cm</td></tr><tr><td>Airline fit</td><td>91%</td></tr><tr><td>Price</td><td>$330</td></tr></tbody></table>

## Key differences between the KS Ultralight KS27 and Tom Bihn Aeronaut 30L

-   **Compression straps:** 2 on the KS Ultralight KS27; No on the Tom Bihn Aeronaut 30L.
-   **Passport pocket:** Top on the KS Ultralight KS27; Side on the Tom Bihn Aeronaut 30L.
-   **Backpack straps:** Yes on the KS Ultralight KS27; Hideable on the Tom Bihn Aeronaut 30L.
-   **Main compartments:** 2 on the KS Ultralight KS27; 5 on the Tom Bihn Aeronaut 30L.
-   **Water bottle pockets:** 2, side on the KS Ultralight KS27; No on the Tom Bihn Aeronaut 30L.

Both have: 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. 163 accept both. 1 accept only the KS Ultralight KS27, and 9 accept only the Tom Bihn Aeronaut 30L.

### Only the KS Ultralight KS27 fits

Great Lakes Airlines.

### Only the Tom Bihn Aeronaut 30L fits

Belavia, Etihad Airways, Liat Airlines, Oman Air, Qatar Airways, Royal Jordanian, Scoot, Tiger Airways, WestJet.

## KS Ultralight KS27 vs. Tom Bihn Aeronaut 30L: which should you pack?

The **Tom Bihn Aeronaut 30L** carries 3L more than the **KS Ultralight KS27** (27L vs. 30L), while the **KS Ultralight KS27** is the lighter pack at 0.3kg (vs. 1.3kg). For carry-on flexibility, the **Tom Bihn Aeronaut 30L** fits 91% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Tom Bihn Aeronaut 30L; if you want to travel lighter, the KS Ultralight KS27 is the better call.