---
url: "https://onebag.travel/compare/kq4hid7zll/tom-bihn-aeronaut-45l/l7agtd2du4/topo-travel-bag-40l/"
title: "Tom Bihn Aeronaut 45L vs Topo Travel Bag 40L"
description: "Tom Bihn Aeronaut 45L vs Topo Travel Bag 40L: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/kq4hid7zll/tom-bihn-aeronaut-45l/l7agtd2du4/topo-travel-bag-40l/"
---
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3.  Tom Bihn Aeronaut 45L vs. Topo Travel Bag 40L

# Tom Bihn Aeronaut 45L vs. Topo Travel Bag 40L

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

## [Tom Bihn Aeronaut 45L](https://onebag.travel/carryon/kq4hid7zll/tom-bihn-aeronaut-45l/)

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

![Front facing view of the Tom Bihn Aeronaut 45L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601602491/carryons/tomaero45_hv7dhp.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>45 L</td></tr><tr><td>Weight</td><td>1.4 kg</td></tr><tr><td>Dimensions</td><td>56×36×23 cm</td></tr><tr><td>Airline fit</td><td>45%</td></tr><tr><td>Price</td><td>$340</td></tr></tbody></table>

## Feature by feature

| Tom Bihn Aeronaut 45L | Feature | Topo Travel Bag 40L |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 1 | Opening | 1 |
| side | Passport | front |
| N | Passthrough | N |
| Carry |
| hideable | Backpack | hideable |
| removable | Hip Belt | removable |
| removable | Sternum Strap | removable |
| Inside |
| N | Laptop | 15in |
| 5 | Main Compartments | 4 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| N | Water Bottle Holder | 2, side |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>1050 denier ballistic nylon OR ultralight 400d Halcyon/420d nylon ripstop 200 denier Halcyon/nylon ripstop fabric lining</td><td>1000D recycled nylon,</td></tr></tbody></table>

## [Topo Travel Bag 40L](https://onebag.travel/carryon/l7agtd2du4/topo-travel-bag-40l/)

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

![Front facing view of the Topo Travel Bag 40L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1617230517/carryons/Topo_Travel_Bag_-_40L_hretnv.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>40 L</td></tr><tr><td>Weight</td><td>1.7 kg</td></tr><tr><td>Dimensions</td><td>57×36×19 cm</td></tr><tr><td>Airline fit</td><td>16%</td></tr><tr><td>Price</td><td>$230</td></tr></tbody></table>

## Key differences between the Tom Bihn Aeronaut 45L and Topo Travel Bag 40L

-   **Passport pocket:** Side on the Tom Bihn Aeronaut 45L; Front on the Topo Travel Bag 40L.
-   **Laptop sleeve:** No on the Tom Bihn Aeronaut 45L; 15in on the Topo Travel Bag 40L.
-   **Main compartments:** 5 on the Tom Bihn Aeronaut 45L; 4 on the Topo Travel Bag 40L.
-   **Water bottle pockets:** No on the Tom Bihn Aeronaut 45L; 2, side on the Topo Travel Bag 40L.

Both have: 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. 29 accept both. 56 accept only the Tom Bihn Aeronaut 45L, and 2 accept only the Topo Travel Bag 40L.

### Only the Tom Bihn Aeronaut 45L fits

Aegean Airlines, Air Asia, Air Astana, Air Macau, Air Nostrum, Air Wisconsin, AirAsiaX, Alaska Airlines, Allegiant Air, American Airlines, Atlas Global, Avianca , Bahamasair, Bangkok Airways, Biman Bangladesh, British Airways, Cambodia Angkor Air, Cathay Pacific, Cebu Pacific, China Airlines, CommutAir, Copa Airlines, Delta Airlines, Dragonair, EL AL, EVA Air, Finnair, Garuda Indonesia, Hawaiian Airlines, Hong Kong Airlines, Iran Aseman Air, Jet2, jetBlue Airways, Jetstar Airways, Jetstar Asia, Kulula, Kuwait Air, Malaysia Airlines, Mango, Middle East Airlines, Monarch Airlines, Onur Air, Qantas Airways, Republic Airways, Skywest, Inc., South African Airways, Spirit Airlines, SriLankan Airlines, Thai Airways, Trans States, Travel Service Airlines, United Airlines, Uzbekistan Air, Vietnam Airlines, Virgin Atlantic, WOW Airlines.

### Only the Topo Travel Bag 40L fits

Caribbean Airlines, Croatia Air.

## Tom Bihn Aeronaut 45L vs. Topo Travel Bag 40L: which should you pack?

The **Tom Bihn Aeronaut 45L** carries 5L more than the **Topo Travel Bag 40L** (45L vs. 40L), while the **Tom Bihn Aeronaut 45L** is the lighter pack at 1.4kg (vs. 1.7kg). For carry-on flexibility, the **Tom Bihn Aeronaut 45L** fits 45% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Tom Bihn Aeronaut 45L; if you want to travel lighter, the Tom Bihn Aeronaut 45L is the better call.