---
url: "https://onebag.travel/compare/ayd517mvmi/alpha-one-niner-sert-penumbra-2-0-backpack/u2a954sl34/alpaka-gear-elements-travel-backpack/"
title: "Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs Alpaka Gear Elements Travel Backpack"
description: "Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs Alpaka Gear Elements Travel Backpack: capacity, weight, dimensions and how many airlines accept each as a…"
source: "https://onebag.travel/compare/ayd517mvmi/alpha-one-niner-sert-penumbra-2-0-backpack/u2a954sl34/alpaka-gear-elements-travel-backpack/"
---
1.  [Home](https://onebag.travel/)
2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs. Alpaka Gear Elements Travel Backpack

# Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs. Alpaka Gear Elements Travel Backpack

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

## [Alpha One-Niner SERT, PENUMBRA 2.0 Backpack](https://onebag.travel/carryon/ayd517mvmi/alpha-one-niner-sert-penumbra-2-0-backpack/)

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

![Front facing view of the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990332/carryons/alpha-one-niner-sert-penumbra-2-0-backpack-ayd517mvmi.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>1.5 kg</td></tr><tr><td>Dimensions</td><td>47×30×14 cm</td></tr><tr><td>Airline fit</td><td>93%</td></tr><tr><td>Price</td><td>$255</td></tr></tbody></table>

## Feature by feature

| Alpha One-Niner SERT, PENUMBRA 2.0 Backpack | Feature | Alpaka Gear Elements Travel Backpack |
| --- | --- | --- |
| Storage |
| 2 | Compression | 2 |
| None | Expanded Capacity | None |
| 1 | Opening | 1 |
| front | Passport | front, side |
| Y | Passthrough | Y |
| Carry |
| Y | Backpack | Y |
| optional | Hip Belt | hideable |
| removable | Sternum Strap | removable |
| Inside |
| 16in | Laptop | 16in |
| 5 | Main Compartments | 3 |
| Y | Organizer | Y |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | 1, side |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>Available in: X-Pac X42, 500D, 630D HD</td><td>X-Pac VX42 in Black Axoflux Recycled Fabric (POLY 600D) in Black, Army Green &amp; Blue</td></tr></tbody></table>

## [Alpaka Gear Elements Travel Backpack](https://onebag.travel/carryon/u2a954sl34/alpaka-gear-elements-travel-backpack/)

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

![Front facing view of the Alpaka Gear Elements Travel Backpack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990330/carryons/alpaka-gear-elements-travel-backpack-u2a954sl34.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>1.6 kg</td></tr><tr><td>Dimensions</td><td>52×31×20 cm</td></tr><tr><td>Airline fit</td><td>88%</td></tr><tr><td>Price</td><td>$260</td></tr></tbody></table>

## Key differences between the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack and Alpaka Gear Elements Travel Backpack

-   **Passport pocket:** Front on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; Front, side on the Alpaka Gear Elements Travel Backpack.
-   **Hip belt:** Optional on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; Hideable on the Alpaka Gear Elements Travel Backpack.
-   **Main compartments:** 5 on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; 3 on the Alpaka Gear Elements Travel Backpack.
-   **Water bottle pockets:** 2, side on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; 1, side on the Alpaka Gear Elements Travel Backpack.

Both have: compression straps, luggage passthrough, backpack straps, 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. 167 accept both. 8 accept only the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack, and 0 accept only the Alpaka Gear Elements Travel Backpack.

### Only the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack fits

Air Niugini, Belavia, Etihad Airways, Oman Air, Qatar Airways, Regional Express, Royal Jordanian, Virgin Australia.

## Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs. Alpaka Gear Elements Travel Backpack: which should you pack?

The **Alpaka Gear Elements Travel Backpack** carries 14L more than the **Alpha One-Niner SERT, PENUMBRA 2.0 Backpack** (21L vs. 35L), while the **Alpha One-Niner SERT, PENUMBRA 2.0 Backpack** is the lighter pack at 1.5kg (vs. 1.6kg). For carry-on flexibility, the **Alpha One-Niner SERT, PENUMBRA 2.0 Backpack** fits 93% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Alpaka Gear Elements Travel Backpack; if you want to travel lighter, the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack is the better call.