Thule Force 3 M 400L Roof Box – Black Matte

Versatile 400L Car Roof Box for Family Holidays, Road Trips & Everyday Adventures

The Thule Force 3 M 400L Roof Box in Black Matte combines generous storage capacity, rugged durability and aerodynamic design in a practical, medium-sized roof box.

With a spacious 400-litre capacity, a maximum load capacity of 75kg and a lightweight 16.5kg construction, this premium Thule roof box provides valuable additional luggage space for family holidays, camping adventures, weekend breaks and everyday travel.

Featuring Thule's durable AeroSkin finish, PowerClick quick-mount system, SlideLock security mechanism and convenient dual-side opening, the Force 3 M is designed to make transporting extra equipment simple and secure.

Whether you're exploring the Scottish Highlands, travelling the North Coast 500 or heading away on a family holiday, the Thule Force 3 M helps free up valuable space inside your vehicle.

Key Features & Benefits

• 400L Storage Capacity – Generous extra space for luggage, camping equipment, outdoor gear and family holiday essentials.

• 75kg Maximum Load Capacity – Carry additional equipment securely, subject to your vehicle and roof bar weight limits.

• Compact 175cm Length – A practical medium-sized design for drivers who don't need an extra-long roof box.

• Lightweight 16.5kg Construction – Combines useful storage capacity with manageable roof box weight.

• Durable AeroSkin Finish – Tough, textured Black Matte surface designed to withstand regular everyday use.

• Aerodynamic Design – Streamlined profile helps reduce air resistance and wind noise compared with less aerodynamic cargo solutions.

• PowerClick Quick-Mount System – Integrated torque indicator clicks when the correct mounting force is reached.

• SlideLock Security System – Automatically secures the lid and indicates when the roof box is correctly closed.

• Dual-Side Opening – Access your luggage and equipment from either side of the vehicle.

• Optimised Boot Access – Forward mounting position helps reduce the risk of interference with your rear tailgate.

• Winter Sports Compatible – Accommodates approximately 4–6 pairs of skis or 3–4 snowboards, depending on their dimensions.

• Thule One-Key System Compatible – Can be incorporated into a compatible Thule One-Key locking setup.

• Black Matte Styling – A modern, understated appearance that complements cars, estates and SUVs.

Practical 400L Storage for Family Holidays

The Thule Force 3 M Roof Box provides a generous 400 litres of enclosed storage space, making it ideal for drivers who need additional luggage capacity without choosing an oversized cargo box.

Its spacious interior can accommodate suitcases, camping accessories, outdoor clothing and other travel essentials.

By moving bulky equipment onto your vehicle's roof, you can free up valuable passenger and boot space, helping make longer journeys more comfortable.

Whether you're preparing for a family holiday, travelling to a campsite or enjoying a weekend away, the Thule Force 3 M offers a practical solution for carrying extra luggage.

Compact Medium-Sized Design

One of the main advantages of the Thule Force 3 M 400L is its balance of storage capacity and external dimensions.

Measuring 175 × 81 × 44cm, the Force 3 M provides substantial carrying space in a shorter format than the larger Force 3 L and XL models.

Its manageable size makes it a strong option for customers who want a versatile roof box for regular travel.

The forward-positioned design also helps minimise interference with the vehicle's rear tailgate, although vehicle compatibility and hatch clearance must always be checked.

Durable AeroSkin Finish for Everyday Use

The Thule Force 3 M features Thule's rugged AeroSkin surface, designed for durability and regular outdoor use.

Its textured Black Matte finish offers a practical alternative to glossy roof boxes while maintaining a clean, modern appearance.

Whether you're using your roof box for daily equipment transport, weekend camping trips or longer holidays, the durable exterior is designed to withstand the demands of an active lifestyle.

Aerodynamic Design for Comfortable Travel

The Thule Force 3 M features a streamlined aerodynamic profile designed to complement modern vehicles.

Its carefully shaped construction helps reduce wind resistance and road noise compared with less aerodynamic roof storage solutions.

This makes it particularly appealing for motorway journeys, family holidays and longer road trips.

Actual fuel consumption, noise and aerodynamic performance will depend on your vehicle, roof rack setup and driving conditions.

Quick & Secure Installation with PowerClick

Thule's innovative PowerClick mounting system makes installing the Force 3 M onto compatible roof bars quick and straightforward.

The integrated torque indicator produces an audible click when the mounting system reaches the specified tightening force.

This makes it easier to confirm that the roof box has been correctly secured before travelling.

The convenient mounting system is particularly useful for drivers who regularly install and remove their roof box.

Secure Storage with SlideLock

The SlideLock locking system provides practical security for your luggage and equipment.

Separate opening and locking functions automatically secure the roof box lid when properly closed.

The system also indicates when the lid is correctly locked, helping provide reassurance before setting off.

Whether you're carrying family luggage, camping equipment or outdoor essentials, the SlideLock system makes everyday roof box use convenient.

Dual-Side Opening for Easy Loading

The Thule Force 3 M features dual-side opening, allowing access to the interior from either side of your vehicle.

This makes loading luggage, retrieving equipment and organising belongings more convenient.

Dual-side access is particularly useful when parking space is limited or when loading equipment during a longer journey.

The roof box also features a naturally shaped opening handle for comfortable everyday use.

Suitable for Skiing & Winter Sports

The Thule Force 3 M is also suitable for transporting compatible winter sports equipment.

Its interior can accommodate approximately 4–6 pairs of skis or 3–4 snowboards, depending on equipment dimensions.

With a maximum ski length of 155cm, it's best suited to shorter skis and appropriately sized winter sports equipment.

For customers transporting longer adult skis, a longer roof box such as the Thule Force 3 L or XXL Sport may be more suitable.

The compatible Thule Box Ski Carrier Adapter 694-8 is available separately.

Ideal for Scottish Road Trips & Outdoor Adventures

From weekend breaks around Loch Lomond to longer journeys through the Scottish Highlands, the Thule Force 3 M 400L Roof Box provides valuable additional storage for every adventure.

Its combination of generous luggage capacity, durable construction and convenient mounting system makes it well suited to Scottish road trips, camping holidays and everyday travel.

Whether you're exploring the Cairngorms, driving the North Coast 500 or travelling across the UK and Europe, the Force 3 M helps you bring more of what you need.

Technical Specifications

Specification	Details
Brand	Thule
Model	Force 3 M
Product Code	645200
Colour	Black Matte
Capacity	400 litres
External Dimensions	175 × 81 × 44cm
Internal Dimensions	167 × 69 × 38cm
Height Above Roof Bars	41.8cm
Roof Box Weight	16.5kg
Maximum Load Capacity	75kg
Surface Finish	AeroSkin
Mounting System	PowerClick
Locking System	SlideLock
Opening	Dual-Side
Ski Capacity	4–6 Pairs
Snowboard Capacity	3–4
Maximum Ski Length	155cm
Ski Carrier Adapter	Thule 694-8, sold separately
Front Clearance Requirement	Greater than 1149mm
Thule One-Key System	Compatible
Country of Manufacture	Great Britain

Vehicle & Roof Bar Compatibility

The Thule Force 3 M is compatible with a wide range of Thule roof bar systems, including WingBar Evo, WingBar Edge, WingBar and SquareBar Evo.

Some roof rack systems require additional mounting accessories:

• Thule SlideBar and ProBar Evo – Thule T-Track Adapter 697-6.

• Thule Caprock – Thule Caprock Cargo Box Kit.

Before purchasing, check your vehicle's maximum permitted roof load, roof bar compatibility and rear tailgate clearance.

The roof box weighs 16.5kg and has a maximum cargo capacity of 75kg. The combined weight of the roof box, roof bars and contents must remain within your vehicle's permitted roof load.

Thule specifies a front clearance measurement greater than 1149mm to help prevent the roof box interfering with your vehicle's rear hatch.

Why Buy Your Thule Force 3 M from West End Outdoors?

At West End Outdoors in Bearsden, Glasgow, we help customers find quality Thule roof boxes, roof bars and vehicle carrying solutions for their adventures.

Whether you're looking for a medium-sized roof box for family holidays, additional luggage space for camping trips or a versatile roof box for everyday use, our team can help you find the right Thule equipment.

Shop the Thule Force 3 M 400L Roof Box in Black Matte at West End Outdoors and make more room for every adventure.