---
url: "https://onebag.travel/compare/u9gebyvt58/attitude-supply-atd1-backpack/ynae3xywz6/alpha-one-niner-whitley-backpack/"
title: "Attitude Supply ATD1 Backpack vs Alpha One-Niner Whitley Backpack"
description: "Attitude Supply ATD1 Backpack vs Alpha One-Niner Whitley Backpack: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/u9gebyvt58/attitude-supply-atd1-backpack/ynae3xywz6/alpha-one-niner-whitley-backpack/"
---
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2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  Attitude Supply ATD1 Backpack vs. Alpha One-Niner Whitley Backpack

# Attitude Supply ATD1 Backpack vs. Alpha One-Niner Whitley Backpack

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

## [Attitude Supply ATD1 Backpack](https://onebag.travel/carryon/u9gebyvt58/attitude-supply-atd1-backpack/)

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

![Front facing view of the Attitude Supply ATD1 Backpack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990472/carryons/attitude-supply-atd1-backpack-u9gebyvt58.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>23 L</td></tr><tr><td>Weight</td><td>1.7 kg</td></tr><tr><td>Dimensions</td><td>50×30×26 cm</td></tr><tr><td>Airline fit</td><td>17%</td></tr><tr><td>Price</td><td>$523</td></tr></tbody></table>

## Feature by feature

| Attitude Supply ATD1 Backpack | Feature | Alpha One-Niner Whitley Backpack |
| --- | --- | --- |
| Storage |
| 4 | Compression | N |
| 55L | Expanded Capacity | None |
| 1 | Opening | 1 |
| front | Passport | front |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| removable | Hip Belt | N |
| removable | Sternum Strap | removable |
| Inside |
| 16in | Laptop | 16in |
| 2 | Main Compartments | 3 |
| 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>Challenge Sailcloth Ecopak® EPLX600</td><td>Available in:X-Pac X42, 500D, 1050D Ballistic Nylon</td></tr></tbody></table>

## [Alpha One-Niner Whitley Backpack](https://onebag.travel/carryon/ynae3xywz6/alpha-one-niner-whitley-backpack/)

by [Alpha One-Niner](https://onebag.travel/carryons/?brands=Alpha One-Niner)

![Front facing view of the Alpha One-Niner Whitley Backpack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990332/carryons/alpha-one-niner-whitley-backpack-ynae3xywz6.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>20 L</td></tr><tr><td>Weight</td><td>1.2 kg</td></tr><tr><td>Dimensions</td><td>47×28×15 cm</td></tr><tr><td>Airline fit</td><td>93%</td></tr><tr><td>Price</td><td>$200</td></tr></tbody></table>

## Key differences between the Attitude Supply ATD1 Backpack and Alpha One-Niner Whitley Backpack

-   **Compression straps:** 4 on the Attitude Supply ATD1 Backpack; No on the Alpha One-Niner Whitley Backpack.
-   **Hip belt:** Removable on the Attitude Supply ATD1 Backpack; No on the Alpha One-Niner Whitley Backpack.
-   **Main compartments:** 2 on the Attitude Supply ATD1 Backpack; 3 on the Alpha One-Niner Whitley Backpack.

Both have: passport pocket, backpack straps, 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. 32 accept both. 0 accept only the Attitude Supply ATD1 Backpack, and 144 accept only the Alpha One-Niner Whitley Backpack.

### Only the Alpha One-Niner Whitley Backpack fits

Aegean Airlines, Aer Lingus, Aeroflot, Aerolineas Argentinas, Aeromexico, Air Asia, Air Astana, Air Baltic, Air Canada, Air Caraibes, Air China, Air France, Air India, Air Macau, Air Malta, Air Mauritius, Air Niugini, Air Nostrum, Air Serbia, Air Seychelles, Air Wisconsin, AirAsiaX, Alaska Airlines, All Nipon Airways, Allegiant Air, American Airlines, ANA, Asiana Airlines, ATA Airlines, Atlas Global, Austrian, Avianca , Azerbaijan Airlines, Bahamasair, Bangkok Airways, Belavia, Biman Bangladesh, Blue Air, Boliviana de Aviacion, British Airways, Brussels Airlines, Bulgaria Air, Cambodia Angkor Air, Cathay Pacific, Cayman Airways, Cebu Pacific, China Airlines, China Eastern, CommutAir, Conviasa, Czech Airlines, Delta Airlines, Dragonair, EL AL, Emirates Airlines, Enter Air, Ethiopian Airlines, Etihad Airways, Eurowings, EVA Air, Fiji Airways, Finnair, Flair Air, flybe, Garuda Indonesia, Gol Linhas Aereas, Great Lakes Airlines, Hawaiian Airlines, Hong Kong Airlines, Iberia, Icelandair, Indigo, InselAir, Interjet, Iran Air, Iran Aseman Air, Japan Airlines, Jet Airways, Jet2, jetBlue Airways, Jetstar Airways, Jetstar Asia, Juneyao Airlines, Kenya Airways, KLM, Kulula, Kuwait Air, LATAM , Liat Airlines, LOT Polish, Lufthansa, Luxair, Mahan Air, Malaysia Airlines, Mango, Meridiana Fly, Mesa Airlines, Middle East Airlines, Monarch Airlines, Nordwind Airlines, Norwegian, Oman Air, Onur Air, Pakistan International, Peach, Porter Airlines, Qantas Airways, Qatar Airways, Regional Express, Republic Airways, Royal Brunei Airlines, Royal Jordanian, Ryanair, S7, SAS Scandinavian, Scoot, Shandong Airlines, Shenzhen Airlines, Sky Airlines, Skywest, Inc., South African Airways, SriLankan Airlines, Sun Express, Swiss Int'l Air Lines, TAP Air Portugal, TAROM, Thai Airways, Tianjin Airlines (A320 & E190), Tiger Airways, Trans States, Travel Service Airlines, TUI, Turkish Airlines, Ukraine International, United Airlines, Uzbekistan Air, Vietnam Airlines, VIM Airlines (Closed), Virgin Atlantic, Virgin Australia, Volotea, WestJet, WOW Airlines, Xiamen.

## Attitude Supply ATD1 Backpack vs. Alpha One-Niner Whitley Backpack: which should you pack?

The **Attitude Supply ATD1 Backpack** carries 3L more than the **Alpha One-Niner Whitley Backpack** (23L vs. 20L), while the **Alpha One-Niner Whitley Backpack** is the lighter pack at 1.2kg (vs. 1.7kg). For carry-on flexibility, the **Alpha One-Niner Whitley Backpack** fits 93% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Attitude Supply ATD1 Backpack; if you want to travel lighter, the Alpha One-Niner Whitley Backpack is the better call.