When there is not enough space in the trunk, and you need to take things with you, additional equipment for the roof of the car comes to the rescue. Many drivers are faced with confusion in terminology: what exactly is called closed roof rack — box, case, trunk or container? In fact, all of these names can be used, but with nuances.
In this article we will look at the correct names of different types of closed roof racks, how they differ from open beams and arches, what materials are used to make them, and what to look for when choosing. You will also learn about popular brands, installation features and legal aspects of using such equipment.
What is a closed roof rack and what is it called?
An enclosed roof rack is a sealed container that fits onto the roll bars or roof rails of your vehicle. Unlike open beams or baskets, it completely protects the load from rain, snow, dust and wind. In the automotive community, such products are called differently:
- 📦 Car box - the most common name, suitable for most models.
- 🧳 Roof case - often used for compact options that resemble a suitcase.
- 🚗 Roof case - an outdated, but still common term, especially among owners of Soviet cars.
- 📦 Roofbox (from English roof box) is a professional name common in manufacturers' catalogs.
- 🔄 Luggage container - a universal term suitable for both plastic and aluminum models.
It is important to understand that all these names mean the same thing - sealed box for transporting cargo on the roof, but may differ in design, material and method of fastening. For example, roofboxes from Thule or Hapro are often called boxes, and compact models for city cars are called cases.
Open structures (arches, beams, baskets) do not belong to closed trunks, since they do not protect the cargo from external influences. Their main purpose is to secure long objects (skis, boards, ladders), while closed boxes are designed for transporting suitcases, backpacks, strollers and other things that require protection.
Types of closed trunks: classification by shape and materials
Closed roof racks are divided into several types depending on the shape, material and purpose. The right choice depends on what kind of cargo you plan to transport, how often you will use the box and what vehicle you will install it on.
By shape and volume
| Boxing type | Volume (l) | Features | What cars is it suitable for? |
|---|---|---|---|
| Compact (cases) | 200–350 | Light, narrow, often with a soft shell. Suitable for small items (backpacks, shoes). | City hatchbacks, sedans (Toyota Corolla, Hyundai Solaris). |
| Average | 350–500 | Universal, most popular. Accommodates 2-3 suitcases or a baby stroller. | Crossovers, station wagons (Skoda Octavia, Kia Sportage). |
| Large (family) | 500–700 | Tall and spacious, often with two-way opening. Suitable for long trips. | SUVs, minivans (Volkswagen Multivan, Toyota Land Cruiser). |
| Extended (for skis/snowboards) | 400–600 | Narrow and long, with internal fastenings for sports equipment. | Any car with roof rails, often used on Subaru Outback or Audi Q5. |
Based on materials
- 🧊 Plastic (ABS plastic) - lightweight, resistant to UV radiation, but can crack in severe frosts. Popular brands: Thule, Hapro, Mont Blanc.
- ⚡ Aluminum - strong, durable, but heavier and more expensive. Often used for expedition trips. Examples: Alu-Box, Front Runner.
- 🧵 Soft (cases) - not airtight, but ultra-compact when folded. Suitable for occasional use. Brands: SeaSucker, Rightline Gear.
- 🔄 Hybrid — a combination of a plastic body and aluminum stiffeners. The best option for price and quality.
Important: aluminum boxes weigh 1.5–2 times more than plastic ones with the same volume, which increases fuel consumption and the load on the roof. Before purchasing, check the maximum load capacity of your vehicle's roof rails (usually indicated in the owner's manual).
How to check the load-carrying capacity of a roof?
The maximum load is indicated in the car's operating manual (section "Technical Specifications" or "Additional Equipment"). For most passenger cars this is 50–75 kg, for crossovers - up to 100 kg. Excessive weight may cause roof deformation or poor handling.
How to choose the right closed trunk: 5 key criteria
Choosing a closed trunk is a more difficult task than it seems. Mistakes can lead to aerodynamic problems, excessive fuel consumption, or even damage to the vehicle. Here's what to look for:
1. Compatible with roof rails
Not all boxes fit all roof rails. There are three types of fastenings:
- 🔧 Universal - Attached to most roof rails using clips (suitable for Thule WingBar, Hapro RLS).
- 🔩 Specialized — are developed for specific car models (for example, for Volvo XC60 or BMW X5).
- 🧲 Magnetic/vacuum - do not require roof rails, but are only suitable for smooth metal roofs (for example, SeaSucker).
Before purchasing, check whether the selected model supports your roof rail system. For example, boxes Thule Motion XT compatible with most crossbars, and Hapro TravelBox adapters may be required.
2. Aerodynamics and noise
A poorly designed box can increase fuel consumption by 10-15% and create a lot of noise at speeds over 90 km/h. Please note:
- The shape of the leading edge (drop-shaped is optimal).
- Availability of anti-vibration pads.
- User reviews on noise levels (e.g. Thule Vector considered one of the quietest).
3. Volume vs. car dimensions
The box should not protrude beyond the dimensions of the car in front or behind (according to Russian traffic regulations - no more than 1 m from the extreme point of the car). To check:
- Measure the length of the roof from the front to the rear edge.
- Subtract 20–30 cm for extra space (for fastenings and safety).
- Compare with the length of the box (indicated in the specifications).
Example: if the length of your roof Kia Sorento - 180 cm, then the maximum length of the box should be no more than 150–160 cm.
4. Opening method
Boxes are:
- 🔄 Double sided — open on both sides (convenient for parking in narrow places).
- 🔙 Unilateral - cheaper, but less practical.
- 🔝 With top cover - a rare option, suitable for tall cars (for example, Ford Transit).
5. Security and burglary protection
Cheap boxes are often equipped with unreliable locks that can be opened with a screwdriver. Please note:
- Availability central lock (for example, in Thule Motion).
- Lock material (optimally stainless steel).
- Possibility of additional fixation with cables.
Check compatibility with your car's roof rails|
Measure the length of the roof and compare with the dimensions of the box|
Assess the volume: is there enough space for your things?|
Make sure the box does not block your view through the rear window|
Check reviews for noise levels at high speeds -->
Top 5 brands of closed trunks: comparison and features
There are dozens of manufacturers on the market, but only a few brands have earned the trust of car owners due to quality, reliability and innovation. Let's look at the top five:
1. Thule (Sweden)
Thule - the undisputed leader in quality and technology. Boxes of this brand are different:
- 🔧 Quick installation system
PowerClick- fastening in a few seconds. - 🌬️ Aerodynamic design - minimal noise and air resistance.
- 🔒 Anti-burglary locks.
Popular models: Thule Motion XT (universal), Thule Vector (premium class).
2. Hapro (Germany)
Hapro offers optimal value for money. Features:
- 💰 The price is 20–30% lower than Thule with similar characteristics.
- 🔄 Double-sided opening even in budget models.
- 🧊 Reinforced plastic, frost-resistant down to -40°C.
Best models: Hapro TravelBox 460, Hapro SkyBox 580.
3. Mont Blanc (France)
Brand Mont Blanc specializes in boxes for family trips. Their features:
- 👨👩👧👦 Large internal volume (up to 600 l).
- 🎨 Designer colors (for example, carbon or metallic).
- 🔧 Easy assembly without additional tools.
Popular model: Mont Blanc Grand Tour 580.
4. Alu-Box (Germany)
Alu-Box - the choice for extreme conditions. These aluminum boxes:
- 🛡️ Withstand loads up to 100 kg.
- 🔥 Doesn't burn or melt (important for expeditions).
- 🔄 Modular system - You can purchase additional fasteners.
SUV model: Alu-Box Expedition.
5. SeaSucker (USA)
Uniqueness SeaSucker — in a mount without rails:
- 🧲 Vacuum suction cups can withstand up to 90 kg.
- 🚗 Suitable for cars without roof rails (for example, Tesla Model 3).
- 💨 Soft cases for rare use.
Popular model: SeaSucker Monkey Bars.
If you often drive off-road, choose aluminum boxes - they do not crack due to vibrations, unlike plastic ones.
Installing a closed trunk: step-by-step instructions
Installing a roof box is a responsible process. Improper installation may result in loss of cargo or damage to the vehicle. Follow this instruction:
1. Preparing the car and tools
You will need:
- 🔧 A set of hexagons (usually included with the box).
- 📏 Tape measure for measuring the distance between the rails.
- 🧴 Lubricant for rubber seals (for example, silicone).
- 🔦 Flashlight (if you work in the dark).
Before installation:
- Wash the roof and roof rails thoroughly - dirt can prevent a tight seal.
- Check the roof rails for corrosion or damage.
- Make sure that the weight of the empty box does not exceed the permissible roof load.
2. Assembly of fasteners
Most boxes are delivered unassembled. Proceed according to the scheme:
- Assemble the box frame (if it is modular).
- Install the mounting feet on the bottom of the box. Tighten the screws crosswise to avoid distortion.
- Adjust the width of the legs to the distance between the roof rails of your car.
Attention: Do not use a power tool to tighten as this may damage the plastic or strip the threads.
3. Roof installation
It is better to do this work with an assistant:
- Carefully lift the box and install it on the rails, aligning the fasteners with the crossbars.
- Tighten the retaining screws or latches (depending on model).
- Check that the box does not wobble - the permissible play is no more than 1-2 mm.
For models with suction cups (e.g. SeaSucker):
- Clean the roof surface with alcohol.
- Wet the suction cups with water for better grip.
- Secure the box and check the tightness using the indicator lever.
4. Security check
After installation:
- 🔍 Visually inspect all fastenings.
- 🚗 Drive 100–200 meters and check if there is any play or extraneous sounds.
- 🔒 Make sure the locks are securely fixed.
⚠️ Attention: If after installation the box whistles at speeds above 80 km/h, check the tightness of the seals and the symmetry of the fasteners. Often the problem is solved by tightening the screws or applying silicone grease to the rubber parts.
After installing the box, be sure to adjust the tire pressure - additional load on the roof may require an increase in pressure by 0.2–0.3 atm.
Legal aspects: what the law says about roof racks
The use of a closed roof rack is regulated by traffic rules and technical regulations of the Customs Union. Key points to know:
1. Dimensions and protruding parts
According to Traffic rules of the Russian Federation, clause 23.3:
- Boxing shouldn't perform front more than 1 m from the extreme point of the vehicle.
- The rear protrusion can be up to 2 m (but for passenger cars they are usually limited to 1 m).
- On the sides, the load should not protrude more than 0.4 m from the outer edge of the headlight or side light.
Example: if the length of your Renault Duster — 4.3 m, then the maximum length of the box, taking into account the fastenings, should not exceed 5.3 m (4.3 + 1 m in front or back).
2. Lighting and alarm
If the box covers the tail lights or brake lights, you must:
- 🔴 Install additional lighting devices on the box itself.
- 📛 Apply reflective elements (red at the back, white at the front).
For boxes longer than 1 m, the rear is also required "Bulky cargo" sign (orange square with border).
3. Speed mode
With the roof rack closed, we recommend:
- 🚗 On the highway, do not exceed 90–100 km/h (even if the permitted speed is higher).
- 🌬️ In case of strong side wind, reduce speed to 70–80 km/h.
⚠️ Attention: In an accident involving a vehicle with a cargo improperly secured on its roof, the driver may be found at fault—even if the accident occurred for another reason. This is stated in Resolution of the Plenum of the Supreme Court of the Russian Federation No. 20.
4. Registration and technical inspection
According to Technical Regulations of the Customs Union 018/2011:
- Roof box not subject to registration at the traffic police department, if it is removable.
- When passing a technical inspection, only reliability of fastening and compliance with dimensions.
If the box is installed permanently (for example, welded to the roof), this is considered design change and requires approval from the traffic police.
Common mistakes when using closed trunks
Even experienced drivers sometimes make mistakes that lead to breakdowns or fines. Let's look at the most common ones:
1. Excessive load
Many people forget that:
- 🔢 The maximum load is indicated taking into account the weight of the box itself. For example, if the limit is 75 kg, and the box weighs 20 kg, then you can only take 55 kg of weight.
- 🚗 The load is distributed evenly - heavy things are placed in the center.
Consequences of being overweight:
- Deformation of the roof (especially on cars without factory roof rails).
- Poor handling at high speeds.
- Increased wear on the suspension.
2. Incorrect load distribution
Typical mistakes:
- 🧳 Heavy things (tools, batteries) are placed on one side → skewed.
- 🏂 Long objects (skis, boards) are fixed only in front → vibration and displacement.
- 📦 The load is not secured inside the box → hits the walls when braking.
Correct distribution:
- Heavy things are in the center, closer to the roof.
- Light items (clothing, sleeping bags) - at the edges.
- Long objects are fixed at two points (front and back).
3. Ignoring maintenance
The box requires maintenance, like any other part of the car:
- 🧴 Seals need to be lubricated with silicone 2 times a year.
- 🔧 Fastenings check before each trip.
- 🧼 Inner surface wash and dry after rain.
⚠️ Attention: If the seals have lost their elasticity, the box will begin to leak. A replacement will cost 1,500–3,000 rubles, but this is cheaper than repairing electronics in the trunk after a rain.
4. Operation in extreme conditions
What not to do:
- ❄️ Use the box at temperatures below -30°C (plastic becomes fragile).
- ☀️ Leave in the sun at +50°C (hull deformation).
- 🚿 Wash under high pressure (seals may be damaged).
For winter use:
- Use special silicone lubricants for frost.
- Before riding, clear the bindings of snow and ice.
- Do not store the box outdoors at sub-zero temperatures.
FAQ: Answers to popular questions
❓ Do I need to register the roof box with the traffic police?
No, if the box is removable and does not change the design of the car. Permanent installation (eg welding) requires approval.
❓ Is it possible to open the box on the go?
Absolutely not! Even at low speed, this can lead to loss of cargo or damage to the box. Perform all operations only while parked.
❓ Which box is better - plastic or aluminum?
Plastic ones are lighter and cheaper, but less durable. Aluminum ones are more expensive, but can withstand extreme loads and do not break in the cold. The choice depends on the operating conditions.
❓ Is it possible to transport animals in a box?
Technically it is possible, but it is inhumane - in a sealed space, animals will experience stress from stuffiness and noise. It is better to use special transport boxes with ventilation.
❓ How long does a closed trunk last?
Service life depends on material and care:
- Plastic boxes - 5–7 years.
- Aluminum - 10–15 years.
- Soft covers - 3–5 seasons.
Regular lubrication of seals and careful operation will extend their service life.