---
url: "https://onebag.travel/compare/5cw6d36vky/kathmandu-solus-pack-20/y1h7unap16/boundary-supply-rennen-x-pac-daypack/"
title: "Kathmandu Solus Pack 20 vs Boundary Supply Rennen X-Pac Daypack"
description: "Kathmandu Solus Pack 20 vs Boundary Supply Rennen X-Pac Daypack: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/5cw6d36vky/kathmandu-solus-pack-20/y1h7unap16/boundary-supply-rennen-x-pac-daypack/"
---
1.  [Home](https://onebag.travel/)
2.  [Carry-On Travel Backpacks](https://onebag.travel/carryons/)
3.  Kathmandu Solus Pack 20 vs. Boundary Supply Rennen X-Pac Daypack

# Kathmandu Solus Pack 20 vs. Boundary Supply Rennen X-Pac Daypack

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

## [Kathmandu Solus Pack 20](https://onebag.travel/carryon/5cw6d36vky/kathmandu-solus-pack-20/)

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

![Front facing view of the Kathmandu Solus Pack 20](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1627616335/carryons/Kathmandu_Solus_Pack_tshnnr.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>20 L</td></tr><tr><td>Weight</td><td>0.42 kg</td></tr><tr><td>Dimensions</td><td>47×28×19 cm</td></tr><tr><td>Airline fit</td><td>93%</td></tr><tr><td>Price</td><td>$60</td></tr></tbody></table>

## Feature by feature

| Kathmandu Solus Pack 20 | Feature | Boundary Supply Rennen X-Pac Daypack |
| --- | --- | --- |
| Storage |
| N | Compression | N |
| None | Expanded Capacity | None |
| 4 | Opening | 4 |
| N | Passport | N |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| N | Hip Belt | N |
| N | Sternum Strap | N |
| Inside |
| 15in | Laptop | 15in |
| 1 | Main Compartments | 1 |
| N | Organizer | N |
| Outside |
| × | Hard Shell | × |
| N | Rain-fly | N |
| N | Water Bottle Holder | 1 |
| N | Water Resistant | Y |

<table class="cmp-material"><tbody><tr><td colspan="2">Material</td></tr><tr><td>100% Polyester</td><td>Custom VX21 X-Pac material</td></tr></tbody></table>

## [Boundary Supply Rennen X-Pac Daypack](https://onebag.travel/carryon/y1h7unap16/boundary-supply-rennen-x-pac-daypack/)

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

![Front facing view of the Boundary Supply Rennen X-Pac Daypack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1620707394/carryons/Boundary_Supply_Rennen_tsojqe.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>22 L</td></tr><tr><td>Weight</td><td>0.9 kg</td></tr><tr><td>Dimensions</td><td>46×28×18 cm</td></tr><tr><td>Airline fit</td><td>95%</td></tr><tr><td>Price</td><td>$170</td></tr></tbody></table>

## Key differences between the Kathmandu Solus Pack 20 and Boundary Supply Rennen X-Pac Daypack

-   **Water bottle pockets:** No on the Kathmandu Solus Pack 20; 1 on the Boundary Supply Rennen X-Pac Daypack.
-   **Water resistant:** No on the Kathmandu Solus Pack 20; Yes on the Boundary Supply Rennen X-Pac Daypack.

Both have: backpack straps, laptop sleeve.

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

We checked both bags against the carry-on size limits of 189 airlines. 176 accept both. 0 accept only the Kathmandu Solus Pack 20, and 3 accept only the Boundary Supply Rennen X-Pac Daypack.

### Only the Boundary Supply Rennen X-Pac Daypack fits

American Eagle, easyJet, Ravn Alaska.

## Kathmandu Solus Pack 20 vs. Boundary Supply Rennen X-Pac Daypack: which should you pack?

The **Boundary Supply Rennen X-Pac Daypack** carries 2L more than the **Kathmandu Solus Pack 20** (20L vs. 22L), while the **Kathmandu Solus Pack 20** is the lighter pack at 0.42kg (vs. 0.9kg). For carry-on flexibility, the **Boundary Supply Rennen X-Pac Daypack** fits 95% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Boundary Supply Rennen X-Pac Daypack; if you want to travel lighter, the Kathmandu Solus Pack 20 is the better call.