---
url: "https://onebag.travel/compare/ut39o0uw8z/aer-day-pack-3/wbguakrqwy/ministry-of-supply-boston-one/"
title: "Aer Day Pack 3 vs Ministry of Supply Boston One"
description: "Aer Day Pack 3 vs Ministry of Supply Boston One: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/ut39o0uw8z/aer-day-pack-3/wbguakrqwy/ministry-of-supply-boston-one/"
---
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2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  Aer Day Pack 3 vs. Ministry of Supply Boston One

# Aer Day Pack 3 vs. Ministry of Supply Boston One

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

## [Aer Day Pack 3](https://onebag.travel/carryon/ut39o0uw8z/aer-day-pack-3/)

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

![Front facing view of the Aer Day Pack 3](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990291/carryons/aer-day-pack-3-ut39o0uw8z.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>14 L</td></tr><tr><td>Weight</td><td>1.3 kg</td></tr><tr><td>Dimensions</td><td>44×30×14 cm</td></tr><tr><td>Airline fit</td><td>95%</td></tr><tr><td>Price</td><td>$160</td></tr></tbody></table>

## Feature by feature

| Aer Day Pack 3 | Feature | Ministry of Supply Boston One |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 1 | Opening | 1 |
| top | Passport | top |
| Y | Passthrough | Y |
| Carry |
| Y | Backpack | hideable |
| N | Hip Belt | N |
| Y | Sternum Strap | Y |
| Inside |
| 16in | Laptop | 16in |
| 3 | Main Compartments | 4 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 1, side | Water Bottle Holder | 1, internal |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>1680D Cordura® ballistic nylon exterior (bluesign® approved)</td><td>900D 100% polyester shell</td></tr></tbody></table>

## [Ministry of Supply Boston One](https://onebag.travel/carryon/wbguakrqwy/ministry-of-supply-boston-one/)

by [Ministry of Supply](https://onebag.travel/carryons/?brands=Ministry of Supply)

![Front facing view of the Ministry of Supply Boston One](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990385/carryons/ministry-of-supply-boston-one-wbguakrqwy.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>28 L</td></tr><tr><td>Weight</td><td>1.1 kg</td></tr><tr><td>Dimensions</td><td>47×30×20 cm</td></tr><tr><td>Airline fit</td><td>93%</td></tr><tr><td>Price</td><td>$250</td></tr></tbody></table>

## Key differences between the Aer Day Pack 3 and Ministry of Supply Boston One

-   **Backpack straps:** Yes on the Aer Day Pack 3; Hideable on the Ministry of Supply Boston One.
-   **Main compartments:** 3 on the Aer Day Pack 3; 4 on the Ministry of Supply Boston One.
-   **Water bottle pockets:** 1, side on the Aer Day Pack 3; 1, internal on the Ministry of Supply Boston One.

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. 175 accept both. 5 accept only the Aer Day Pack 3, and 0 accept only the Ministry of Supply Boston One.

### Only the Aer Day Pack 3 fits

Air Tahiti, American Eagle, easyJet, Gulf Air, Ravn Alaska.

## Aer Day Pack 3 vs. Ministry of Supply Boston One: which should you pack?

The **Ministry of Supply Boston One** carries 14L more than the **Aer Day Pack 3** (14L vs. 28L), while the **Ministry of Supply Boston One** is the lighter pack at 1.1kg (vs. 1.3kg). For carry-on flexibility, the **Aer Day Pack 3** fits 95% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Ministry of Supply Boston One; if you want to travel lighter, the Ministry of Supply Boston One is the better call.