---
url: "https://onebag.travel/compare/2rbg4dtslw/aer-travel-pack-4-35l/x3ehf3pst9/peak-design-travel-backpack-45l/"
title: "Aer Travel Pack 4 35L vs Peak Design Travel Backpack 45L"
description: "Aer Travel Pack 4 35L vs Peak Design Travel Backpack 45L: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/2rbg4dtslw/aer-travel-pack-4-35l/x3ehf3pst9/peak-design-travel-backpack-45l/"
---
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3.  Aer Travel Pack 4 35L vs. Peak Design Travel Backpack 45L

# Aer Travel Pack 4 35L vs. Peak Design Travel Backpack 45L

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

## [Aer Travel Pack 4 35L](https://onebag.travel/carryon/2rbg4dtslw/aer-travel-pack-4-35l/)

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

![Front facing view of the Aer Travel Pack 4 35L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990469/carryons/aer-travel-pack-4-35l-2rbg4dtslw.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>35 L</td></tr><tr><td>Weight</td><td>1.8 kg</td></tr><tr><td>Dimensions</td><td>55×34×23 cm</td></tr><tr><td>Airline fit</td><td>68%</td></tr><tr><td>Price</td><td>$260</td></tr></tbody></table>

## Feature by feature

| Aer Travel Pack 4 35L | Feature | Peak Design Travel Backpack 45L |
| --- | --- | --- |
| Storage |
| N | Compression | 1 |
| None | Expanded Capacity | 45L |
| 1 | Opening | 1 |
| top | Passport | top |
| Y | Passthrough | Y |
| Carry |
| Y | Backpack | hideable |
| optional | Hip Belt | hideable |
| removable | Sternum Strap | removable |
| Inside |
| 16in | Laptop | 16in |
| 5 | Main Compartments | 7 |
| Y | Organizer | Y |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | 2, side |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>1680D CORDURA® ballistic nylon exterior (bluesign® approved)</td><td>shell: Weatherproof 400D nylon canvas bottom: 900D nylon weatherproof zippers</td></tr></tbody></table>

## [Peak Design Travel Backpack 45L](https://onebag.travel/carryon/x3ehf3pst9/peak-design-travel-backpack-45l/)

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

![Front facing view of the Peak Design Travel Backpack 45L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990502/carryons/peak-design-travel-backpack-45l-x3ehf3pst9.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>35 L</td></tr><tr><td>Weight</td><td>2.1 kg</td></tr><tr><td>Dimensions</td><td>56×33×24 cm</td></tr><tr><td>Airline fit</td><td>26%</td></tr><tr><td>Price</td><td>$300</td></tr></tbody></table>

## Key differences between the Aer Travel Pack 4 35L and Peak Design Travel Backpack 45L

-   **Compression straps:** No on the Aer Travel Pack 4 35L; 1 on the Peak Design Travel Backpack 45L.
-   **Backpack straps:** Yes on the Aer Travel Pack 4 35L; Hideable on the Peak Design Travel Backpack 45L.
-   **Hip belt:** Optional on the Aer Travel Pack 4 35L; Hideable on the Peak Design Travel Backpack 45L.
-   **Main compartments:** 5 on the Aer Travel Pack 4 35L; 7 on the Peak Design Travel Backpack 45L.

Both have: passport pocket, luggage passthrough, sternum strap, laptop sleeve, built-in organizer, water bottle pockets, water resistant.

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

We checked both bags against the carry-on size limits of 189 airlines. 49 accept both. 80 accept only the Aer Travel Pack 4 35L, and 0 accept only the Peak Design Travel Backpack 45L.

### Only the Aer Travel Pack 4 35L fits

Aer Lingus, Aeroflot, Aerolineas Argentinas, Aeromexico, Air Asia, Air Canada, Air Caraibes, Air France, Air India, Air Macau, Air Mauritius, Air Wisconsin, AirAsiaX, Alaska Airlines, All Nipon Airways, Allegiant Air, American Airlines, ANA, Austrian, Avianca , Azerbaijan Airlines, Bahamasair, Bangkok Airways, Biman Bangladesh, Boliviana de Aviacion, Brussels Airlines, Cambodia Angkor Air, Cathay Pacific, Cayman Airways, Cebu Pacific, China Airlines, CommutAir, Croatia Air, Czech Airlines, Delta Airlines, Dragonair, Ethiopian Airlines, Eurowings, EVA Air, Fiji Airways, Flair Air, Garuda Indonesia, Gol Linhas Aereas, Hawaiian Airlines, Hong Kong Airlines, Iberia, Indigo, Interjet, Iran Air, Japan Airlines, Jet Airways, jetBlue Airways, Jetstar Airways, Jetstar Asia, Kenya Airways, KLM, Kulula, LATAM , LOT Polish, Lufthansa, Mahan Air, Malaysia Airlines, Mango, Mesa Airlines, Norwegian, Peach, Porter Airlines, Qantas Airways, Republic Airways, SAS Scandinavian, Sky Airlines, Skywest, Inc., South African Airways, SriLankan Airlines, Swiss Int'l Air Lines, Trans States, Turkish Airlines, United Airlines, Vietnam Airlines, Virgin Atlantic.

## Aer Travel Pack 4 35L vs. Peak Design Travel Backpack 45L: which should you pack?

The **Aer Travel Pack 4 35L** carries the same capacity as the **Peak Design Travel Backpack 45L** (35L vs. 35L), while the **Aer Travel Pack 4 35L** is the lighter pack at 1.8kg (vs. 2.1kg). For carry-on flexibility, the **Aer Travel Pack 4 35L** fits 68% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Aer Travel Pack 4 35L; if you want to travel lighter, the Aer Travel Pack 4 35L is the better call.