---
url: "https://onebag.travel/compare/ayd517mvmi/alpha-one-niner-sert-penumbra-2-0-backpack/qdlqly1nsv/tomtoc-urbanex-t77-laptop-backpack-26l/"
title: "Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs tomtoc UrbanEX-T77 Laptop Backpack 26L"
description: "Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs tomtoc UrbanEX-T77 Laptop Backpack 26L: 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/qdlqly1nsv/tomtoc-urbanex-t77-laptop-backpack-26l/"
---
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3.  Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs. tomtoc UrbanEX-T77 Laptop Backpack 26L

# Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs. tomtoc UrbanEX-T77 Laptop Backpack 26L

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 | tomtoc UrbanEX-T77 Laptop Backpack 26L |
| --- | --- | --- |
| Storage |
| 2 | Compression | N |
| None | Expanded Capacity | None |
| 1 | Opening | 1 |
| front | Passport | top |
| Y | Passthrough | Y |
| Carry |
| Y | Backpack | Y |
| optional | Hip Belt | N |
| removable | Sternum Strap | Y |
| Inside |
| 16in | Laptop | 16in |
| 5 | Main Compartments | 5 |
| 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>Available in: X-Pac X42, 500D, 630D HD</td><td>400D splash-resistant polyester</td></tr></tbody></table>

## [tomtoc UrbanEX-T77 Laptop Backpack 26L](https://onebag.travel/carryon/qdlqly1nsv/tomtoc-urbanex-t77-laptop-backpack-26l/)

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

![Front facing view of the tomtoc UrbanEX-T77 Laptop Backpack 26L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990449/carryons/tomtoc-urbanex-t77-laptop-backpack-26l-qdlqly1nsv.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>26 L</td></tr><tr><td>Weight</td><td>1.2 kg</td></tr><tr><td>Dimensions</td><td>48×31×22 cm</td></tr><tr><td>Airline fit</td><td>74%</td></tr><tr><td>Price</td><td>$120</td></tr></tbody></table>

## Key differences between the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack and tomtoc UrbanEX-T77 Laptop Backpack 26L

-   **Compression straps:** 2 on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; No on the tomtoc UrbanEX-T77 Laptop Backpack 26L.
-   **Passport pocket:** Front on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; Top on the tomtoc UrbanEX-T77 Laptop Backpack 26L.
-   **Hip belt:** Optional on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; No on the tomtoc UrbanEX-T77 Laptop Backpack 26L.
-   **Sternum strap:** Removable on the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack; Yes on the tomtoc UrbanEX-T77 Laptop Backpack 26L.

Both have: luggage passthrough, backpack straps, 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. 139 accept both. 36 accept only the Alpha One-Niner SERT, PENUMBRA 2.0 Backpack, and 0 accept only the tomtoc UrbanEX-T77 Laptop Backpack 26L.

### 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, flybe, Icelandair, InselAir, Juneyao Airlines, Liat Airlines, Luxair, Meridiana Fly, Nordwind Airlines, Royal Brunei Airlines, Ryanair, S7, Shandong Airlines, Shenzhen Airlines, Sun Express, TAP Air Portugal, TAROM, Tianjin Airlines (A320 & E190), TUI, Ukraine International, VIM Airlines (Closed), Volotea, Xiamen.

## Alpha One-Niner SERT, PENUMBRA 2.0 Backpack vs. tomtoc UrbanEX-T77 Laptop Backpack 26L: which should you pack?

The **tomtoc UrbanEX-T77 Laptop Backpack 26L** carries 5L more than the **Alpha One-Niner SERT, PENUMBRA 2.0 Backpack** (21L vs. 26L), while the **tomtoc UrbanEX-T77 Laptop Backpack 26L** is the lighter pack at 1.2kg (vs. 1.5kg). 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 tomtoc UrbanEX-T77 Laptop Backpack 26L; if you want to travel lighter, the tomtoc UrbanEX-T77 Laptop Backpack 26L is the better call.