---
url: "https://onebag.travel/compare/ahyvuk1jes/attitude-supply-atd2-backpack/ei8e6lj504/tom-bihn-synik-30/"
title: "Attitude Supply ATD2 Backpack vs Tom Bihn Synik 30"
description: "Attitude Supply ATD2 Backpack vs Tom Bihn Synik 30: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/ahyvuk1jes/attitude-supply-atd2-backpack/ei8e6lj504/tom-bihn-synik-30/"
---
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3.  Attitude Supply ATD2 Backpack vs. Tom Bihn Synik 30

# Attitude Supply ATD2 Backpack vs. Tom Bihn Synik 30

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

## [Attitude Supply ATD2 Backpack](https://onebag.travel/carryon/ahyvuk1jes/attitude-supply-atd2-backpack/)

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

![Front facing view of the Attitude Supply ATD2 Backpack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990291/carryons/attitude-supply-atd2-backpack-ahyvuk1jes.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>18 L</td></tr><tr><td>Weight</td><td>1.3 kg</td></tr><tr><td>Dimensions</td><td>45×25×19 cm</td></tr><tr><td>Airline fit</td><td>96%</td></tr><tr><td>Price</td><td>$475</td></tr></tbody></table>

## Feature by feature

| Attitude Supply ATD2 Backpack | Feature | Tom Bihn Synik 30 |
| --- | --- | --- |
| Storage |
| 4 | Compression | N |
| 31L | Expanded Capacity | None |
| 1 | Opening | 1 |
| front | Passport | front |
| Y | Passthrough | Y |
| Carry |
| removable | Backpack | Y |
| removable | Hip Belt | removable |
| removable | Sternum Strap | removable |
| Inside |
| 15in | Laptop | 15in |
| 2 | Main Compartments | 6 |
| Y | Organizer | Y |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | 1, front |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>Challenge Sailcloth Ecopak® EPLX600</td><td>Ultralight 400d Halcyon/420d nylon ripstop</td></tr></tbody></table>

## [Tom Bihn Synik 30](https://onebag.travel/carryon/ei8e6lj504/tom-bihn-synik-30/)

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

![Front facing view of the Tom Bihn Synik 30](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/carryons/su48yo8t3umjr3tqx4uo)

<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>51×34×28 cm</td></tr><tr><td>Airline fit</td><td>14%</td></tr><tr><td>Price</td><td>$345</td></tr></tbody></table>

## Key differences between the Attitude Supply ATD2 Backpack and Tom Bihn Synik 30

-   **Compression straps:** 4 on the Attitude Supply ATD2 Backpack; No on the Tom Bihn Synik 30.
-   **Backpack straps:** Removable on the Attitude Supply ATD2 Backpack; Yes on the Tom Bihn Synik 30.
-   **Main compartments:** 2 on the Attitude Supply ATD2 Backpack; 6 on the Tom Bihn Synik 30.
-   **Water bottle pockets:** 2, side on the Attitude Supply ATD2 Backpack; 1, front on the Tom Bihn Synik 30.

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

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

We checked both bags against the carry-on size limits of 189 airlines. 26 accept both. 155 accept only the Attitude Supply ATD2 Backpack, and 0 accept only the Tom Bihn Synik 30.

### Only the Attitude Supply ATD2 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 Tahiti, Air Wisconsin, AirAsiaX, Alaska Airlines, All Nipon Airways, Allegiant Air, American Airlines, American Eagle, 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, Copa Airlines, Croatia Air, Czech Airlines, Delta Airlines, Dragonair, easyJet, EL AL, Emirates Airlines, Enter Air, Ethiopian Airlines, Etihad Airways, Eurowings, EVA Air, Fiji Airways, Finnair, Flair Air, flybe, Frontier Airlines, Garuda Indonesia, Gol Linhas Aereas, Great Lakes Airlines, Gulf Air, 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, PenAir, Porter Airlines, Qantas Airways, Qatar Airways, Ravn Alaska, 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, Southwest Airlines, Spirit Airlines, 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 ATD2 Backpack vs. Tom Bihn Synik 30: which should you pack?

The **Tom Bihn Synik 30** carries 12L more than the **Attitude Supply ATD2 Backpack** (18L vs. 30L), while the **Attitude Supply ATD2 Backpack** is the lighter pack at 1.3kg (vs. 1.3kg). For carry-on flexibility, the **Attitude Supply ATD2 Backpack** fits 96% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Tom Bihn Synik 30; if you want to travel lighter, the Attitude Supply ATD2 Backpack is the better call.