---
url: "https://onebag.travel/compare/ahyvuk1jes/attitude-supply-atd2-backpack/asynuuvno8/the-brown-buffalo-conceal-pack-21l/"
title: "Attitude Supply ATD2 Backpack vs The Brown Buffalo Conceal Pack 21L"
description: "Attitude Supply ATD2 Backpack vs The Brown Buffalo Conceal Pack 21L: 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/asynuuvno8/the-brown-buffalo-conceal-pack-21l/"
---
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3.  Attitude Supply ATD2 Backpack vs. The Brown Buffalo Conceal Pack 21L

# Attitude Supply ATD2 Backpack vs. The Brown Buffalo Conceal Pack 21L

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 | The Brown Buffalo Conceal Pack 21L |
| --- | --- | --- |
| Storage |
| 4 | Compression | N |
| 31L | Expanded Capacity | None |
| 1 | Opening | 1 |
| front | Passport | front |
| Y | Passthrough | Y |
| Carry |
| removable | Backpack | Y |
| removable | Hip Belt | N |
| removable | Sternum Strap | removable |
| Inside |
| 15in | Laptop | 15in |
| 2 | Main Compartments | 2 |
| Y | 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>Challenge Sailcloth Ecopak® EPLX600</td><td>Challenge® Sailcloth EPX400</td></tr></tbody></table>

## [The Brown Buffalo Conceal Pack 21L](https://onebag.travel/carryon/asynuuvno8/the-brown-buffalo-conceal-pack-21l/)

by [The Brown Buffalo](https://onebag.travel/carryons/?brands=The Brown Buffalo)

![Front facing view of the The Brown Buffalo Conceal Pack 21L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990440/carryons/the-brown-buffalo-conceal-pack-21l-asynuuvno8.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>21 L</td></tr><tr><td>Weight</td><td>1.3 kg</td></tr><tr><td>Dimensions</td><td>50×30×15 cm</td></tr><tr><td>Airline fit</td><td>92%</td></tr><tr><td>Price</td><td>$325</td></tr></tbody></table>

## Key differences between the Attitude Supply ATD2 Backpack and The Brown Buffalo Conceal Pack 21L

-   **Compression straps:** 4 on the Attitude Supply ATD2 Backpack; No on the The Brown Buffalo Conceal Pack 21L.
-   **Backpack straps:** Removable on the Attitude Supply ATD2 Backpack; Yes on the The Brown Buffalo Conceal Pack 21L.
-   **Hip belt:** Removable on the Attitude Supply ATD2 Backpack; No on the The Brown Buffalo Conceal Pack 21L.
-   **Built-in organizer:** Yes on the Attitude Supply ATD2 Backpack; No on the The Brown Buffalo Conceal Pack 21L.
-   **Water bottle pockets:** 2, side on the Attitude Supply ATD2 Backpack; No on the The Brown Buffalo Conceal Pack 21L.

Both have: passport pocket, luggage passthrough, sternum strap, laptop sleeve, water resistant.

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

We checked both bags against the carry-on size limits of 189 airlines. 173 accept both. 8 accept only the Attitude Supply ATD2 Backpack, and 0 accept only the The Brown Buffalo Conceal Pack 21L.

### Only the Attitude Supply ATD2 Backpack fits

Air Tahiti, American Eagle, easyJet, Great Lakes Airlines, Gulf Air, Ravn Alaska, Regional Express, Virgin Australia.

## Attitude Supply ATD2 Backpack vs. The Brown Buffalo Conceal Pack 21L: which should you pack?

The **The Brown Buffalo Conceal Pack 21L** carries 3L more than the **Attitude Supply ATD2 Backpack** (18L vs. 21L), 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 The Brown Buffalo Conceal Pack 21L; if you want to travel lighter, the Attitude Supply ATD2 Backpack is the better call.