---
url: "https://onebag.travel/compare/8aqroxn420/knack-bags-medium-expandable-knack-pack-v2/ynae3xywz6/alpha-one-niner-whitley-backpack/"
title: "Knack Bags Medium Expandable Knack Pack v2 vs Alpha One-Niner Whitley Backpack"
description: "Knack Bags Medium Expandable Knack Pack v2 vs Alpha One-Niner Whitley Backpack: capacity, weight, dimensions and how many airlines accept each as a carry-on…"
source: "https://onebag.travel/compare/8aqroxn420/knack-bags-medium-expandable-knack-pack-v2/ynae3xywz6/alpha-one-niner-whitley-backpack/"
---
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2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  Knack Bags Medium Expandable Knack Pack v2 vs. Alpha One-Niner Whitley Backpack

# Knack Bags Medium Expandable Knack Pack v2 vs. Alpha One-Niner Whitley Backpack

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

## [Knack Bags Medium Expandable Knack Pack v2](https://onebag.travel/carryon/8aqroxn420/knack-bags-medium-expandable-knack-pack-v2/)

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

![Front facing view of the Knack Bags Medium Expandable Knack Pack v2](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990374/carryons/knack-bags-medium-expandable-knack-pack-v2-8aqroxn420.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>24 L</td></tr><tr><td>Weight</td><td>1.4 kg</td></tr><tr><td>Dimensions</td><td>48×31×11 cm</td></tr><tr><td>Airline fit</td><td>92%</td></tr><tr><td>Price</td><td>$265</td></tr></tbody></table>

## Feature by feature

| Knack Bags Medium Expandable Knack Pack v2 | Feature | Alpha One-Niner Whitley Backpack |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| 35L | Expanded Capacity | None |
| 1 | Opening | 1 |
| front | Passport | front |
| N | Passthrough | N |
| Carry |
| hideable | Backpack | Y |
| N | Hip Belt | N |
| removable | Sternum Strap | removable |
| Inside |
| 16in | Laptop | 16in |
| 3 | Main Compartments | 3 |
| N | Organizer | Y |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 1, side | Water Bottle Holder | 2, side |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>PU coated 420 denier, high-density nylon</td><td>Available in:X-Pac X42, 500D, 1050D Ballistic Nylon</td></tr></tbody></table>

## [Alpha One-Niner Whitley Backpack](https://onebag.travel/carryon/ynae3xywz6/alpha-one-niner-whitley-backpack/)

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

![Front facing view of the Alpha One-Niner Whitley Backpack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990332/carryons/alpha-one-niner-whitley-backpack-ynae3xywz6.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>20 L</td></tr><tr><td>Weight</td><td>1.2 kg</td></tr><tr><td>Dimensions</td><td>47×28×15 cm</td></tr><tr><td>Airline fit</td><td>93%</td></tr><tr><td>Price</td><td>$200</td></tr></tbody></table>

## Key differences between the Knack Bags Medium Expandable Knack Pack v2 and Alpha One-Niner Whitley Backpack

-   **Backpack straps:** Hideable on the Knack Bags Medium Expandable Knack Pack v2; Yes on the Alpha One-Niner Whitley Backpack.
-   **Built-in organizer:** No on the Knack Bags Medium Expandable Knack Pack v2; Yes on the Alpha One-Niner Whitley Backpack.
-   **Water bottle pockets:** 1, side on the Knack Bags Medium Expandable Knack Pack v2; 2, side on the Alpha One-Niner Whitley Backpack.

Both have: passport pocket, 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. 174 accept both. 0 accept only the Knack Bags Medium Expandable Knack Pack v2, and 2 accept only the Alpha One-Niner Whitley Backpack.

### Only the Alpha One-Niner Whitley Backpack fits

Air Niugini, Great Lakes Airlines.

## Knack Bags Medium Expandable Knack Pack v2 vs. Alpha One-Niner Whitley Backpack: which should you pack?

The **Knack Bags Medium Expandable Knack Pack v2** carries 4L more than the **Alpha One-Niner Whitley Backpack** (24L vs. 20L), while the **Alpha One-Niner Whitley Backpack** is the lighter pack at 1.2kg (vs. 1.4kg). For carry-on flexibility, the **Alpha One-Niner Whitley Backpack** fits 93% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Knack Bags Medium Expandable Knack Pack v2; if you want to travel lighter, the Alpha One-Niner Whitley Backpack is the better call.