Updated:26 October 2026
Rank 1-19 of the best Car Roof Boxes 400l
Our recommendation Price Customer rating
1. Comparison winner
COSTWAY Car Roof Box 480L
COSTWAY Car Roof Box 480L
Available immediately
free shipping
  • capacity of 480 litres for luggage, tents or sports equipment
  • made from tough polypropylene and carbon fibre for durability and weather resistance
  • features a keyed locking mechanism to secure belongings
Our rating
9,6
very good
2. Best value
COSTWAY Car Roof Box, 400L
COSTWAY Car Roof Box, 400L
Available immediately
free shipping
  • 400 litres of storage space to carry essentials for trips
  • 75 kg load capacity for reliable transportation
  • constructed from sturdy ABS and PC material for durability and weather resistance
Our rating
9,6
very good
TANGZON 400L Car Roof Box
TANGZON 400L Car Roof Box
Available immediately
free shipping
  • 400 litres of storage capacity for luggage and camping gear, keeping the car interior uncluttered and journeys more comfortable
  • Made from a durable ABS and polycarbonate hard shell, providing strength and weather resistance for daily travel
  • Security feature with locks on both sides and two numbered keys included to keep belongings secure when travelling or stopping along the way
Our rating
9,6
very good
GEARFLOW 430L Gloss Black Car Roof Box - Dual-Side Opening, Security Keys, Waterproof, Fits Most Cars
GEARFLOW 430L Gloss Black Car Roof Box - Dual-Side Opening, Security Keys, Waterproof, Fits Most Cars
Available immediately
free shipping
  • 430 litres of storage capacity for luggage, camping gear or sports equipment
  • maximum load of 75 kilograms when weight is evenly distributed
  • made from impact resistant ABS plastic for durability and weather resistance, fully waterproof and UV protected
Our rating
9,6
very good
No reviews yet
5. Bestseller
Thule Force 3 Roof Cargo Box Matte Black M
Thule Force 3 Roof Cargo Box Matte Black M
Available immediately
free shipping
  • Mounting method enables quick, secure and intuitive attachment with a simple click and an indicator showing when the cargo box is safely attached
  • Road safety and durability are tested to ensure high quality and reliable performance
  • Durable and sleek in appearance, designed for daily use and active lifestyles
Our rating
9,6
very good
MP G3 Krono Car Roof Box 400L
MP G3 Krono Car Roof Box 400L
Available immediately
free shipping
  • 400 litres of storage space, maximum load capacity of 75 kg
  • weight: not specified
  • constructed from durable PS material
Our rating
9,6
very good
COSTWAY Car Roof Box 400L/480L Waterproof Cargo Carrier with Security Keys
COSTWAY Car Roof Box 400L/480L Waterproof Cargo Carrier with Security Keys
Available immediately
free shipping
  • capacity 400 litres of storage space for tents, luggage and equipment without reducing passenger space
  • material made from tough polypropylene and carbon fibre for a durable shell that is windproof, sunproof, dustproof and waterproof
  • security features a keyed locking mechanism to secure belongings and flexible support arms to aid loading and unloading
Our rating
9,5
very good
Mania 400L Roof Box - Black
Mania 400L Roof Box - Black
Available in a few days
free shipping
  • Features a central lock with two locking points and a key lock security system
  • Quick installation with fixing mechanism
Our rating
9,5
very good
GiantexUK 400L Car Roof Box Waterproof Rooftop Cargo Carrier with Security Keys Grey
GiantexUK 400L Car Roof Box Waterproof Rooftop Cargo Carrier with Security Keys Grey
Available immediately
free shipping
  • storage capacity of 400 litres providing additional space for luggage
  • the material is a rugged ABS and PC blend that resists cracking and protects belongings in transit
  • central locking system keeps the lid securely closed and includes two keys
Our rating
9,5
very good
TANGZON 400L Car Roof Box, Locking System, Single/Dual-Side Opening, Waterproof Hard Rooftop Carrier, 169 x 80 x 36.5 cm, Black
TANGZON 400L Car Roof Box, Locking System, Single/Dual-Side Opening, Waterproof Hard Rooftop Carrier, 169 x 80 x 36.5 cm, Black
Available immediately
free shipping
  • storage capacity 400 to 480 litres for luggage and gear
  • material polypropylene, a durable wear-resistant plastic that withstands harsh outdoor conditions
  • security feature safety locking mechanism to keep belongings secure during travel
Our rating
9,5
very good
TANGZON 400L Car Roof Box - Black
TANGZON 400L Car Roof Box - Black
Available immediately
free shipping
  • 400 litres of storage space offers ample capacity for luggage, tents, bags and more
  • constructed from high-quality ABS and PC material for durability and weather resistance
  • features a double lock system with two numbered keys for security
Our rating
9,5
very good
GiantexUK 400L Car Roof Box Heavy Duty Cargo Carrier with Security Keys for SUV/Van (Black)
GiantexUK 400L Car Roof Box Heavy Duty Cargo Carrier with Security Keys for SUV/Van (Black)
Available immediately
free shipping
  • capacity of 400 litres for interior storage providing extra loading space
  • made from ABS and PC for durability and weather resistance with double-reinforced steel stiffeners for added stability
  • central locking system prevents the lid from opening in transit and deters theft, includes two keys which can be removed only when closed and locked
Our rating
9,3
good
GEARFLOW 400L Car Roof Box XL Hard Roof Cargo Carrier with Dual-Side Opening, Security Keys & Waterproof (White)
GEARFLOW 400L Car Roof Box XL Hard Roof Cargo Carrier with Dual-Side Opening, Security Keys & Waterproof (White)
Available immediately
free shipping
  • 400 litres of cargo space with a load limit of 75 kilograms
  • made from rigid ABS and PC materials for durability and weather resistance
  • double lock design to protect valuables
Our rating
8,9
good
GEARFLOW 400 Litre Car Roof Box, White, Dual-Side Opening, Security Keys, Waterproof
GEARFLOW 400 Litre Car Roof Box, White, Dual-Side Opening, Security Keys, Waterproof
Available immediately
free shipping
  • 400 litres of extra storage capacity with a maximum load of 75 kilograms when weight is evenly distributed
  • Material: impact-resistant ABS construction that is fully waterproof and UV protected
  • Security lock: secure locking system with keys to protect valuables and keep the lid aligned when closed
Our rating
8,9
good
No reviews yet
Rooftop Cargo Carrier Bag, 15 cu ft, 1000D Waterproof Heavy-Duty Car Roof Bag for All Vehicles with or without Rack, High-Frequency Welded Seams, Anti-Tear and Anti-Slip Mat, 6 Door Hooks
Rooftop Cargo Carrier Bag, 15 cu ft, 1000D Waterproof Heavy-Duty Car Roof Bag for All Vehicles with or without Rack, High-Frequency Welded Seams, Anti-Tear and Anti-Slip Mat, 6 Door Hooks
Available immediately
free shipping
  • storage capacity of 15 cubic feet
  • material made from 1000D PVC with a triple‑layer high density grid and waterproof coating for weatherproof durability
  • security features include a luggage lock and six security hooks to secure the bag
Our rating
8,6
good
Shield Autocare Roof Top Carrier Bag 600L/400L, 35 kg
Shield Autocare Roof Top Carrier Bag 600L/400L, 35 kg
Available immediately
free shipping
  • load capacity of 35 kilograms for luggage and cargo
  • made from durable XPE material
  • easy installation on the roof by simply placing the bag and tying down with straps
Our rating
8,6
good
No reviews yet
TANGZON 14 Cubic Feet Roof Cargo Box
TANGZON 14 Cubic Feet Roof Cargo Box
Available immediately
free shipping
  • 400 litres capacity with a load limit of 35 kilograms, suitable for large luggage and travel needs
  • Easy installation with or without a roof rack, includes detailed instructions
  • Soft foam material acts as a buffer protecting items from impact
Our rating
8,5
good
HOMFME Folding Car Roof Bag, 14 cu ft / 400 L, Waterproof Soft-Shell Rooftop Luggage Carrier with Storage Bag, 4 Reinforced Straps, Anti-Slip Bottom, Grey
HOMFME Folding Car Roof Bag, 14 cu ft / 400 L, Waterproof Soft-Shell Rooftop Luggage Carrier with Storage Bag, 4 Reinforced Straps, Anti-Slip Bottom, Grey
Available immediately
free shipping
  • 400 litres of storage capacity, able to carry up to 35 kilograms
  • made from PE foam with a waterproof outer fabric
  • easy to assemble and disassemble with all accessories included and a straightforward manual
Our rating
8,4
good
Ghligna Car Roof Bag 15 cu ft (400 L) Waterproof with Anti-Slip Mat, Lock and 6 Door Hooks
Ghligna Car Roof Bag 15 cu ft (400 L) Waterproof with Anti-Slip Mat, Lock and 6 Door Hooks
Check delivery time
free shipping
  • capacity of 400 litres
  • material 420D Oxford fabric with tarpaulin coating
  • security lock built in combination lock
Our rating
7,5
satisfactory

Similar Car Roof Box 400l comparisons

Car Roof Boxes 400l buying guide: How to choose the right product from the above Car Roof Boxes 400l test or comparison

Understanding the Benefits of a Car Roof Box 400l

Extra Storage Space for Your Travels

Imagine heading off on a family road trip or a weekend getaway. You want to take everything you need, from luggage to sports equipment, but your car is just too full. This is where a 400-litre car roof box comes in. It provides a significant amount of extra space, allowing you to store everything you want without cramming your passengers into tight quarters. With a roof box, you can safely transport outdoor gear, holiday luggage, or even camping equipment, all while keeping your vehicle’s interior clutter-free.

Enhanced Comfort and Safety

When your car is cramped with bags and boxes, it can be uncomfortable and distracting for the driver. By using a car roof box, you can ensure that your passengers have ample space to relax during the journey. Plus, having a clear view in the car helps you focus on the road, improving safety for everyone. You can be more relaxed knowing that your items are securely stored above rather than taking up valuable legroom.

Increased Flexibility for Various Activities

A 400-litre roof box is versatile, accommodating a range of activities. Whether you’re going skiing, cycling, or just need extra space for a family trip, this size gives you the flexibility to transport an array of gear without compromising on passenger comfort. This means spontaneous adventures are much easier; you can simply pack your roof box and hit the road.

Choosing the Right Fit for Your Vehicle

Compatibility with Your Car Model

Every vehicle has different dimensions and roof designs, which is why it’s crucial to ensure that the 400-litre roof box you select is compatible with your car. Most manufacturers provide guidelines regarding compatible models. Take a moment to measure your roof space and check your vehicle’s manual for any specific requirements. This helps avoid any inconvenience when trying to attach the box later.

Weight Capacity Considerations

It’s equally important to consider the weight capacity of both your vehicle’s roof rack and the roof box itself. Exceeding weight limits can impact your car’s handling and fuel efficiency. Most 400-litre roof boxes have a maximum weight limit listed clearly in the product description, so look for this detail while shopping. We recommend ensuring the combined weight of the box and contents is well within your vehicle’s limits.

Aerodynamics for Better Fuel Efficiency

Choosing an aerodynamic car roof box helps reduce wind resistance, which can improve your vehicle’s fuel efficiency while driving. Designs with smooth lines and wind deflectors are specifically created to cut through air effectively. For family road trips or longer journeys, this can save you money on petrol and ensure a smoother driving experience.

Packing Tips for Maximising Space

Strategic Packing Methodology

When it comes to packing your 400-litre roof box, think about how to utilise every inch. Start with larger items at the bottom, such as tents or suitcases, and fill in gaps with smaller pieces like shoes or camping gear. Using packing cubes can help organise contents, making it easier to find items later on. Remember to distribute weight evenly for balanced handling during your journey.

Use Soft Bags for Flexibility

Soft bags often mould to the available space better than hard suitcases. Opt for flexible bags for smaller items; they can be squished into the corners of the box, maximizing space. Additionally, consider waterproof covers for fragile or electronic items, ensuring they remain dry and unexposed to the elements.

Leave Room for Expansion

Even if you’re well-organised, plans can change and you might need to bring back more than you intended. When packing, try to leave a bit of extra space in your roof box for any souvenirs or extra gear you might pick up on your travels. This prevents the risk of over-stuffing and keeps your luggage manageable.

Installation Made Easy: How to Attach Your Roof Box

Simple Attachment Process

Installing your car roof box is straightforward. Most models come with a universal mounting system designed for easy attachment to various types of roof racks. Start by placing the box onto the roof rack, ensuring it’s centred, then tighten the clamps according to the instructions provided. If you have a factory-installed rack, make sure to double-check the specifications to ensure a proper fit.

Secure Your Load

Once the roof box is attached, it’s essential to double-check that it’s securely fastened before hitting the road. Give it a shake to confirm it doesn’t move. This is a vital step for ensuring safety while driving, as a properly secured roof box will reduce noise and prevent shifting during transit.

Consulting the Manual for Specific Steps

Even if installation seems intuitive, we recommend consulting the manufacturer’s manual for specific steps and tips. Different models might have unique features that enhance other attributes, such as ease of use or security. Familiarising yourself with the manual will ensure you’re making the most of your roof box’s features.

Why the Car Roof Box 400l is Perfect for Your Next Adventure

Ideal Size for Weekend Trips

For many families and individuals, a 400-litre roof box hits the sweet spot between capacity and manageability. It’s ample enough for weekend trips, whether that’s a family getaway, a trip to the beach, or a sports event. This size means you can carry everything you need, but it’s still manageable for single-person installations.

Enhanced Outdoor Experiences

If you love camping, hiking, or any outdoor activities, a 400-litre roof box provides a practical solution for transporting gear. You can easily store things like sleeping bags, fishing rods, and larger outdoor equipment without compromising on space for your companions.

Long-Distance Travel Made Simple

Planning a long-distance trip? A 400-litre roof box allows for an easy way to expand your luggage allowance without needing a larger vehicle. It incentivises travel by keeping items secure and within reach while also allowing for additional comfort inside the car for everyone.

Table of contents
  1. Understanding the Benefits of a Car Roof Box 400l
  2. Choosing the Right Fit for Your Vehicle
  3. Packing Tips for Maximising Space
  4. Installation Made Easy: How to Attach Your Roof Box
  5. Why the Car Roof Box 400l is Perfect for Your Next Adventure

Overview

1. Comparison winner
COSTWAY Car Roof Box 480L
Our rating
9,6
very good
COSTWAY Car Roof Box 480LAvailable immediately
2. Best value
COSTWAY Car Roof Box, 400L
Our rating
9,6
very good
COSTWAY Car Roof Box, 400LAvailable immediately
TANGZON 400L Car Roof Box
Our rating
9,6
very good
TANGZON 400L Car Roof BoxAvailable immediately
GEARFLOW 430L Gloss Black Car Roof Box - Dual-Side Opening, Security Keys, Waterproof, Fits Most Cars
Our rating
9,6
very good
No reviews yet
GEARFLOW 430L Gloss Black Car Roof Box - Dual-Side Opening, Security Keys, Waterproof, Fits Most CarsAvailable immediately
5. Bestseller
Thule Force 3 Roof Cargo Box Matte Black M
Our rating
9,6
very good
Thule Force 3 Roof Cargo Box Matte Black MAvailable immediately
MP G3 Krono Car Roof Box 400L
Our rating
9,6
very good
MP G3 Krono Car Roof Box 400LAvailable immediately
COSTWAY Car Roof Box 400L/480L Waterproof Cargo Carrier with Security Keys
Our rating
9,5
very good
COSTWAY Car Roof Box 400L/480L Waterproof Cargo Carrier with Security KeysAvailable immediately
Mania 400L Roof Box - Black
Our rating
9,5
very good
Mania 400L Roof Box - BlackAvailable in a few days
Our product comparisons are:
Always up to date:
At most every 120 days, we update each category with new products and research developments in the top rankings. This ensures that our recommendations are always up to date
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Our tests and comparisons are objective and fact-based. Manufacturers have no influence on the ratings. We aim to provide greater transparency in the market, thereby promoting product quality.
Method-driven
In our tests & comparison tables, we only include products that meet our minimum standards. This ensures that you can find the perfect product for your needs from a wide selection.
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