---
url: "https://onebag.travel/compare/5uozk4l5zy/ks-ultralight-ks27/ci7xy95hjm/osprey-tempest-33/"
title: "KS Ultralight KS27 vs Osprey Tempest 33 - One Bag Travel"
description: "KS Ultralight KS27 vs Osprey Tempest 33: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side."
source: "https://onebag.travel/compare/5uozk4l5zy/ks-ultralight-ks27/ci7xy95hjm/osprey-tempest-33/"
---
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3.  KS Ultralight KS27 vs. Osprey Tempest 33

# KS Ultralight KS27 vs. Osprey Tempest 33

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

## [KS Ultralight KS27](https://onebag.travel/carryon/5uozk4l5zy/ks-ultralight-ks27/)

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

![Front facing view of the KS Ultralight KS27](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990375/carryons/ks-ultralight-ks27-5uozk4l5zy.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>27 L</td></tr><tr><td>Weight</td><td>0.3 kg</td></tr><tr><td>Dimensions</td><td>55×28×16 cm</td></tr><tr><td>Airline fit</td><td>87%</td></tr><tr><td>Price</td><td>$130</td></tr></tbody></table>

## Feature by feature

| KS Ultralight KS27 | Feature | Osprey Tempest 33 |
| --- | --- | --- |
| Storage |
| 2 | Compression | 6 |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| top | Passport | top |
| N | Passthrough | N |
| Carry |
| Y | Backpack | Y |
| removable | Hip Belt | Y |
| removable | Sternum Strap | Y |
| Inside |
| N | Laptop | N |
| 2 | Main Compartments | 2 |
| N | Organizer | N |
| 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>X-pac VX 07 YKK "waterproof zip"</td><td>bluesign® APPROVED, 100% recycled 100D high-tenacity nylon w/ dobby check ripstop, DWR treatment made without PFAS</td></tr></tbody></table>

## [Osprey Tempest 33](https://onebag.travel/carryon/ci7xy95hjm/osprey-tempest-33/)

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

![Front facing view of the Osprey Tempest 33](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990495/carryons/osprey-tempest-33-ci7xy95hjm.webp)

<table class="table table-sm cmp-spec mt-2"><tbody><tr><td>Capacity</td><td>33 L</td></tr><tr><td>Weight</td><td>1.2 kg</td></tr><tr><td>Dimensions</td><td>63×31×30 cm</td></tr><tr><td>Airline fit</td><td>1%</td></tr><tr><td>Price</td><td>$200</td></tr></tbody></table>

## Key differences between the KS Ultralight KS27 and Osprey Tempest 33

-   **Compression straps:** 2 on the KS Ultralight KS27; 6 on the Osprey Tempest 33.
-   **Hip belt:** Removable on the KS Ultralight KS27; Yes on the Osprey Tempest 33.
-   **Sternum strap:** Removable on the KS Ultralight KS27; Yes on the Osprey Tempest 33.

Both have: passport pocket, backpack straps, 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. 2 accept both. 162 accept only the KS Ultralight KS27, and 0 accept only the Osprey Tempest 33.

### Only the KS Ultralight KS27 fits

Adria Airways, Aegean Airlines, Aer Lingus, Aeroflot, Aerolineas Argentinas, Aeromexico, Air Asia, Air Astana, Air Baltic, Air Canada, Air Caraibes, Air China, Air Europa, Air France, Air India, Air Koryo, Air Macau, Air Malta, Air Mauritius, Air New Zealand, Air Nostrum, Air Serbia, Air Seychelles, Air Tahiti Nui, Air Wisconsin, AirAsiaX, Alaska Airlines, All Nipon Airways, Allegiant Air, American Airlines, ANA, Asiana Airlines, ATA Airlines, Atlas Global, Austrian, Avianca , Azerbaijan Airlines, Azul Linhas, Bahamasair, Bangkok Airways, Biman Bangladesh, Blue Air, Boliviana de Aviacion, British Airways, Brussels Airlines, Bulgaria Air, Cambodia Angkor Air, Caribbean Airlines, Cathay Pacific, Cayman Airways, Cebu Pacific, China Airlines, China Eastern, China Southern, CommutAir, Conviasa, Copa Airlines, Croatia Air, Cubana de Aviacion, Czech Airlines, Delta Airlines, Dragonair, EL AL, Emirates Airlines, Enter Air, Ethiopian Airlines, Eurowings, EVA Air, Fiji Airways, Finnair, Flair Air, flybe, Frontier Airlines, Garuda Indonesia, Gol Linhas Aereas, Great Lakes Airlines, Hainan Airlines, Hawaiian Airlines, Hong Kong Airlines, Iberia, Icelandair, Indigo, InselAir, Interjet, Iran Air, Iran Aseman Air, Island Air, Japan Airlines, Jet Airways, Jet2, jetBlue Airways, Jetstar Airways, Jetstar Asia, Juneyao Airlines, Kenya Airways, KLM, Korean Air, Kulula, Kuwait Air, LATAM , LOT Polish, Lufthansa, Luxair, Mahan Air, Malaysia Airlines, Mango, Meridiana Fly, Mesa Airlines, Middle East Airlines, Monarch Airlines, Nordwind Airlines, Norwegian, Onur Air, Pakistan International, Peach, PenAir, Philippine Airlines, Porter Airlines, Qantas Airways, Republic Airways, Royal Air Morocco, Royal Brunei Airlines, Ryanair, S7, SAS Scandinavian, Saudi Arabian Airlines, Shandong Airlines, Shenzhen Airlines, Sichuan Airlines, SilkAir, Silver Airways, Singapore Airlines, Sky Airlines, Skywest, Inc., South African Airways, Southwest Airlines, SpiceJet, Spirit Airlines, SriLankan Airlines, Sun Country, Sun Express, Swiss Int'l Air Lines, TAAG Angola, TAM Airlines, TAP Air Portugal, TAROM, Thai Airways, Tianjin Airlines (A320 & E190), Trans States, Travel Service Airlines, TUI, Turkish Airlines, Ukraine International, United Airlines, Ural Airlines, Uzbekistan Air, Vietnam Airlines, VIM Airlines (Closed), Virgin Atlantic, Volotea, WOW Airlines, Xiamen.

## KS Ultralight KS27 vs. Osprey Tempest 33: which should you pack?

The **Osprey Tempest 33** carries 6L more than the **KS Ultralight KS27** (27L vs. 33L), while the **KS Ultralight KS27** is the lighter pack at 0.3kg (vs. 1.2kg). For carry-on flexibility, the **KS Ultralight KS27** fits 87% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Osprey Tempest 33; if you want to travel lighter, the KS Ultralight KS27 is the better call.