---
url: "https://onebag.travel/compare/3la3efqguy/stm-prime/zlayhd2vuw/topo-designs-trip/"
title: "STM Prime vs Topo Designs Trip - One Bag Travel"
description: "STM Prime vs Topo Designs Trip: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/3la3efqguy/stm-prime/zlayhd2vuw/topo-designs-trip/"
---
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2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  STM Prime vs. Topo Designs Trip

# STM Prime vs. Topo Designs Trip

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 | Topo Designs Trip |
| --- | --- | --- |
| 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 | N |
| Inside |
| 13in | Laptop | 11in |
| 2 | Main Compartments | 2 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | N |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>Polyester</td><td></td></tr></tbody></table>

## [Topo Designs Trip](https://onebag.travel/carryon/zlayhd2vuw/topo-designs-trip/)

![Front facing view of the Topo Designs Trip](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601125579/carryons/topotrip_ymur5u.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>8.4 L</td></tr><tr><td>Weight</td><td>0.5 kg</td></tr><tr><td>Dimensions</td><td>41×21×11 cm</td></tr><tr><td>Airline fit</td><td>96%</td></tr><tr><td>Price</td><td>$170</td></tr></tbody></table>

## Key differences between the STM Prime and Topo Designs Trip

-   **Passport pocket:** Top on the STM Prime; Front on the Topo Designs Trip.
-   **Sternum strap:** Yes on the STM Prime; No on the Topo Designs Trip.
-   **Laptop sleeve:** 13in on the STM Prime; 11in on the Topo Designs Trip.
-   **Water bottle pockets:** 2, side on the STM Prime; No on the Topo Designs Trip.

Both have: backpack straps, water resistant.

## Which airlines take each bag as a carry-on

We checked both bags against the carry-on size limits of 189 airlines. 181 accept both. Every airline that takes one takes the other.

## STM Prime vs. Topo Designs Trip: which should you pack?

The **STM Prime** carries 6.6L more than the **Topo Designs Trip** (15L vs. 8.4L), while the **Topo Designs Trip** is the lighter pack at 0.5kg (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 STM Prime; if you want to travel lighter, the Topo Designs Trip is the better call.