---
url: "https://onebag.travel/compare/ypfu4rph/tom-bihn-synapse-25/gpfbufuba2/osprey-flapjack/"
title: "Tom Bihn Synapse 25 vs Osprey Flapjack - One Bag Travel"
description: "Tom Bihn Synapse 25 vs Osprey Flapjack: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/ypfu4rph/tom-bihn-synapse-25/gpfbufuba2/osprey-flapjack/"
---
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2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  Tom Bihn Synapse 25 vs. Osprey Flapjack

# Tom Bihn Synapse 25 vs. Osprey Flapjack

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

## [Tom Bihn Synapse 25](https://onebag.travel/carryon/ypfu4rph/tom-bihn-synapse-25/)

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

![Front facing view of the Tom Bihn Synapse 25](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/carryons/fd7axrvmuogdgtfc9fwr)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>25 L</td></tr><tr><td>Weight</td><td>0.8 kg</td></tr><tr><td>Dimensions</td><td>51×34×23 cm</td></tr><tr><td>Airline fit</td><td>71%</td></tr><tr><td>Price</td><td>$250</td></tr></tbody></table>

## Feature by feature

| Tom Bihn Synapse 25 | Feature | Osprey Flapjack |
| --- | --- | --- |
| Storage |
| N | Compression |  |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| front | Passport | side |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| removable | Hip Belt | removable |
| removable | Sternum Strap |  |
| Inside |
| 15in | Laptop | 15in |
| 6 | Main Compartments | 3 |
| Y | Organizer | Y |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| 1, front | Water Bottle Holder |  |
| Y | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>200 denier Halcyon/nylon ripstop fabric lining 400 denier nylon lower back</td><td>600D Polyspun</td></tr></tbody></table>

## [Osprey Flapjack](https://onebag.travel/carryon/gpfbufuba2/osprey-flapjack/)

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

![Front facing view of the Osprey Flapjack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1601576342/carryons/c9e6c91c-b836-4c78-a9ed-c452b3ce9d5a_rsb3j2.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>21 L</td></tr><tr><td>Weight</td><td>0.9 kg</td></tr><tr><td>Dimensions</td><td>49×34×23 cm</td></tr><tr><td>Airline fit</td><td>72%</td></tr><tr><td>Price</td><td>$110</td></tr></tbody></table>

## Key differences between the Tom Bihn Synapse 25 and Osprey Flapjack

-   **Passport pocket:** Front on the Tom Bihn Synapse 25; Side on the Osprey Flapjack.
-   **Main compartments:** 6 on the Tom Bihn Synapse 25; 3 on the Osprey Flapjack.

Both have: backpack straps, hip belt, laptop sleeve, built-in organizer, water resistant.

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

We checked both bags against the carry-on size limits of 189 airlines. 134 accept both. 0 accept only the Tom Bihn Synapse 25, and 2 accept only the Osprey Flapjack.

### Only the Osprey Flapjack fits

Etihad Airways, Qatar Airways.

## Tom Bihn Synapse 25 vs. Osprey Flapjack: which should you pack?

The **Tom Bihn Synapse 25** carries 4L more than the **Osprey Flapjack** (25L vs. 21L), while the **Tom Bihn Synapse 25** is the lighter pack at 0.8kg (vs. 0.9kg). For carry-on flexibility, the **Osprey Flapjack** fits 72% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Tom Bihn Synapse 25; if you want to travel lighter, the Tom Bihn Synapse 25 is the better call.