---
url: "https://onebag.travel/compare/brsq4qv334/stm-trilogy/s8o6r7ewzt/unbox-therapy-x-pacsafe-25l-anti-theft-backpack/"
title: "STM Trilogy vs Unbox Therapy X Pacsafe 25L Anti-Theft Backpack"
description: "STM Trilogy vs Unbox Therapy X Pacsafe 25L Anti-Theft Backpack: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/brsq4qv334/stm-trilogy/s8o6r7ewzt/unbox-therapy-x-pacsafe-25l-anti-theft-backpack/"
---
1.  [Home](https://onebag.travel/)
2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  STM Trilogy vs. Unbox Therapy X Pacsafe 25L Anti-Theft Backpack

# STM Trilogy vs. Unbox Therapy X Pacsafe 25L Anti-Theft Backpack

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

## [STM Trilogy](https://onebag.travel/carryon/brsq4qv334/stm-trilogy/)

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

![Front facing view of the STM Trilogy](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1634095801/carryons/STM_Trilogy_lukffj.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>0.64 kg</td></tr><tr><td>Dimensions</td><td>46×30×16 cm</td></tr><tr><td>Airline fit</td><td>94%</td></tr><tr><td>Price</td><td>$80</td></tr></tbody></table>

## Feature by feature

| STM Trilogy | Feature | Unbox Therapy X Pacsafe 25L Anti-Theft Backpack |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 4 | Opening | 4 |
| N | Passport | Y |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| N | Hip Belt | N |
| N | Sternum Strap | N |
| Inside |
| 15in | Laptop | 15in |
| 1 | Main Compartments | 1 |
| Y | Organizer | Y |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2 | Water Bottle Holder | 2 |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>100% polyester</td><td>1000D Polina with wax coating, 150D Recycled polyester</td></tr></tbody></table>

## [Unbox Therapy X Pacsafe 25L Anti-Theft Backpack](https://onebag.travel/carryon/s8o6r7ewzt/unbox-therapy-x-pacsafe-25l-anti-theft-backpack/)

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

![Front facing view of the Unbox Therapy X Pacsafe 25L Anti-Theft Backpack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1632308702/carryons/Unox_Therapy_x_Pacsafe_25L_Anti-Theft_Backpack_sbdfcg.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>25 L</td></tr><tr><td>Weight</td><td>1.05 kg</td></tr><tr><td>Dimensions</td><td>47×32×16 cm</td></tr><tr><td>Airline fit</td><td>92%</td></tr><tr><td>Price</td><td>$180</td></tr></tbody></table>

## Key differences between the STM Trilogy and Unbox Therapy X Pacsafe 25L Anti-Theft Backpack

-   **Passport pocket:** No on the STM Trilogy; Yes on the Unbox Therapy X Pacsafe 25L Anti-Theft Backpack.

Both have: 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. 174 accept both. 4 accept only the STM Trilogy, and 0 accept only the Unbox Therapy X Pacsafe 25L Anti-Theft Backpack.

### Only the STM Trilogy fits

Air Niugini, American Eagle, easyJet, Ravn Alaska.

## STM Trilogy vs. Unbox Therapy X Pacsafe 25L Anti-Theft Backpack: which should you pack?

The **Unbox Therapy X Pacsafe 25L Anti-Theft Backpack** carries 1L more than the **STM Trilogy** (24L vs. 25L), while the **STM Trilogy** is the lighter pack at 0.64kg (vs. 1.05kg). For carry-on flexibility, the **STM Trilogy** fits 94% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Unbox Therapy X Pacsafe 25L Anti-Theft Backpack; if you want to travel lighter, the STM Trilogy is the better call.