Kappa KMX400B K'METROBOX Monolock Top Case 40 Liters Matte Black Aluminum

The K'METROBOX KMX400B is Kappa's 40-liter Monolock® top case, featuring a 1.2 mm matte black painted aluminum body with a natural aluminum-colored interior. It holds two demi-jet helmets, opens via the CRABLOCK pressure system by turning the key, and detaches from the motorcycle with a quick-release mechanism. A mounting plate and universal fitting kit are already included. Product code: KMX400B.

✓ Key features

• 40-liter internal capacity – Kappa states that it holds 2 demi-jet helmets
• 1.2 mm matte black painted aluminum – sheet metal body, not painted plastic
• CRABLOCK pressure closure – turning the key lifts the lid, allowing it to open without force
• Quick release with internal knob – the top case can only be detached from the plate when the lid is open
• Mounting plate and universal fitting kit included – no need to purchase them separately
• 6 techno-polymer strap loops – for lashing items to the top of the case that don't fit inside
• Internal lining made of recycled R-PET
• Made in Italy

Technical specifications

Compatibility and assembly

The KMX400B uses the Monolock® mount, the Kappa standard for this range of top cases, and is a universal accessory: the box includes a mounting plate and a universal fitting kit, which attach to the vehicle's rear luggage rack. If your motorcycle or scooter already has a Monolock® plate, the top case attaches directly. For vehicles with dedicated mounts, specific plates are available in the catalog.

Name, dimensions, materials, capacity, and equipment are as stated in the official manufacturer's catalog for code KMX400B. If you have questions about assembly, write to us with your vehicle model and year, and we will verify it for you.

Who it's perfect for

For those who use their motorcycle or scooter daily and want to stop carrying a backpack: 40 liters is enough for two helmets, groceries, or gym gear. And for those who want the look of aluminum travel cases – square, ribbed, matte black – on a Monolock® mount, which is the most widely used and easiest system to install.

Frequently asked questions

Which motorcycles and scooters does it fit?
The KMX400B is a universal top case with a Monolock® mount. Inside the box, you will find the mounting plate and a universal fitting kit that attaches to your vehicle's rear rack. If you already have a Monolock® plate installed, the top case clips directly onto it without extra material.

How much does it actually hold?
The declared internal capacity is 40 liters, and the manufacturer indicates it holds two demi-jet helmets, noting to check helmet dimensions based on brand and model. However, the most stringent constraint is not volume, but the 3 kg maximum load.

How do I open it and detach it from the bike?
It opens with the CRABLOCK system, a pressure-based closure: turning the key lifts the lid slightly so it opens immediately without forcing it. To detach the top case from the plate, there is a quick-release knob inside that only functions when the lid is open.

Is it actually aluminum or painted plastic?
It is real aluminum: the body is 1.2 mm matte black painted aluminum sheet, with a natural aluminum-colored interior. Only the profiles, corners, and the six strap loops are made of techno-polymer—parts designed to absorb impacts without denting.

What is the difference between the KMX400A and KMX400B?
It is the same 40-liter K'METROBOX top case; only the finish differs. The KMX400A is natural aluminum, while the KMX400B is matte black painted with a natural aluminum interior. You are looking at the KMX400B, the black version.

Where is it produced?
The KMX400B is made in Italy. Kappa is a brand of GIVI S.p.A., and this top case is an original manufacturer accessory, not an aftermarket compatible part: it arrives new and boxed, complete with a mounting plate and universal fitting kit.