---
url: "https://onebag.travel/compare/3la3efqguy/stm-prime/f7vvgl9fzq/patagonia-atom-tote-pack-20l/"
title: "STM Prime vs Patagonia Atom Tote Pack 20L - One Bag Travel"
description: "STM Prime vs Patagonia Atom Tote Pack 20L: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/3la3efqguy/stm-prime/f7vvgl9fzq/patagonia-atom-tote-pack-20l/"
---
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3.  STM Prime vs. Patagonia Atom Tote Pack 20L

# STM Prime vs. Patagonia Atom Tote Pack 20L

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

## [STM Prime](https://onebag.travel/carryon/3la3efqguy/stm-prime/)

![Front facing view of the STM Prime](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601123578/carryons/stmprime_yfxzkc.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>15 L</td></tr><tr><td>Weight</td><td>0.7 kg</td></tr><tr><td>Dimensions</td><td>42×26×13 cm</td></tr><tr><td>Airline fit</td><td>96%</td></tr><tr><td>Price</td><td>$80</td></tr></tbody></table>

## Feature by feature

| STM Prime | Feature | Patagonia Atom Tote Pack 20L |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| top | Passport | front |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| N | Hip Belt | N |
| Y | Sternum Strap | removable |
| Inside |
| 13in | Laptop | 13in |
| 2 | Main Compartments | 2 |
| N | 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>Polyester</td><td>7.3-oz 400-denier recycled Polyester with DWR Finish</td></tr></tbody></table>

## [Patagonia Atom Tote Pack 20L](https://onebag.travel/carryon/f7vvgl9fzq/patagonia-atom-tote-pack-20l/)

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

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>20 L</td></tr><tr><td>Weight</td><td>0.6 kg</td></tr><tr><td>Dimensions</td><td>41×30×13 cm</td></tr><tr><td>Airline fit</td><td>95%</td></tr><tr><td>Price</td><td>$90</td></tr></tbody></table>

## Key differences between the STM Prime and Patagonia Atom Tote Pack 20L

-   **Passport pocket:** Top on the STM Prime; Front on the Patagonia Atom Tote Pack 20L.
-   **Sternum strap:** Yes on the STM Prime; Removable on the Patagonia Atom Tote Pack 20L.
-   **Built-in organizer:** No on the STM Prime; Yes on the Patagonia Atom Tote Pack 20L.

Both have: backpack straps, laptop sleeve, 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. 180 accept both. 1 accept only the STM Prime, and 0 accept only the Patagonia Atom Tote Pack 20L.

### Only the STM Prime fits

Great Lakes Airlines.

## STM Prime vs. Patagonia Atom Tote Pack 20L: which should you pack?

The **Patagonia Atom Tote Pack 20L** carries 5L more than the **STM Prime** (15L vs. 20L), while the **Patagonia Atom Tote Pack 20L** is the lighter pack at 0.6kg (vs. 0.7kg). For carry-on flexibility, the **STM Prime** fits 96% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Patagonia Atom Tote Pack 20L; if you want to travel lighter, the Patagonia Atom Tote Pack 20L is the better call.