---
url: "https://onebag.travel/compare/ayd517mvmi/alpha-one-niner-sert-penumbra-2-0-backpack/d6bezomzfw/pakt-travel-backpack/"
title: "Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs Pakt Travel Backpack"
description: "Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs Pakt Travel Backpack: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/ayd517mvmi/alpha-one-niner-sert-penumbra-2-0-backpack/d6bezomzfw/pakt-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. Pakt Travel Backpack

# Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs. Pakt 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 | Pakt Travel Backpack |
| --- | --- | --- |
| Storage |
| 2 | Compression | 2 |
| None | Expanded Capacity | None |
| 1 | Opening | 1 |
| front | Passport | front |
| Y | Passthrough | Y |
| Carry |
| Y | Backpack | hideable |
| optional | Hip Belt | removable |
| removable | Sternum Strap | removable |
| Inside |
| 16in | Laptop | 16in |
| 5 | Main Compartments | 5 |
| 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>500D recycled nylon</td></tr></tbody></table>

## [Pakt Travel Backpack](https://onebag.travel/carryon/d6bezomzfw/pakt-travel-backpack/)

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

![Front facing view of the Pakt Travel Backpack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1618276605/carryons/Pakt_Travel_Backpack_zei5au.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>1.9 kg</td></tr><tr><td>Dimensions</td><td>55×32×21 cm</td></tr><tr><td>Airline fit</td><td>69%</td></tr><tr><td>Price</td><td>$325</td></tr></tbody></table>

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

-   **Backpack straps:** Yes on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; Hideable on the Pakt Travel Backpack.
-   **Hip belt:** Optional on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; Removable on the Pakt Travel Backpack.
-   **Water bottle pockets:** 2, side on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; 1, side on the Pakt Travel Backpack.

Both have: compression straps, passport pocket, luggage passthrough, 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. 130 accept both. 45 accept only the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack, and 0 accept only the Pakt Travel Backpack.

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

Air Baltic, Air China, Air Malta, Air Niugini, Air Serbia, Air Seychelles, Asiana Airlines, ATA Airlines, Belavia, Blue Air, Bulgaria Air, China Eastern, Emirates Airlines, Enter Air, Etihad Airways, flybe, Icelandair, InselAir, Juneyao Airlines, Liat Airlines, Luxair, Meridiana Fly, Nordwind Airlines, Oman Air, Qatar Airways, Regional Express, Royal Brunei Airlines, Royal Jordanian, Ryanair, S7, Scoot, Shandong Airlines, Shenzhen Airlines, Sun Express, TAP Air Portugal, TAROM, Tianjin Airlines (A320 & E190), Tiger Airways, TUI, Ukraine International, VIM Airlines (Closed), Virgin Australia, Volotea, WestJet, Xiamen.

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

The **Pakt 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. 1.9kg). 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 Pakt Travel Backpack; if you want to travel lighter, the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack is the better call.