Kappa KMX400A K'METROBOX Monolock Top Case 40 Liters Natural Aluminum – Universal

The Kappa KMX400A K'METROBOX is the 40-liter Monolock® top case in 1.2 mm natural aluminum, the 2026 novelty in the Kappa range. Monolock® plate and universal mounting kit are included in the package: you don't need to buy anything else to install it. It holds two demi-jet helmets inside, and the internal lining is made of recycled R-PET.

✓ Key strengths

• 1.2 mm natural aluminum – aluminum sheet body, with technopolymer profiles, corners, and strap loops
• True 40 liters – two demi-jet helmets, or your groceries, or your helmet plus backpack
• Plate and universal kit included – everything needed for assembly is in the box
• Six technopolymer strap loops – to secure loads on top of the lid
• Recycled R-PET interior – lined as standard, not an optional extra
• Original Kappa (Givi S.p.A.), not aftermarket

Technical specifications

Vehicle compatibility

The KMX400A is a universal accessory, not a model-specific spare part. The official Kappa catalog provides it "including plate and universal kit": therefore, there is no list of compatible vehicles, and no mounting kit needs to be purchased separately. The KMX400A mounts on scooters and motorcycles prepared to receive a Monolock® plate — typically on the rear luggage rack or the vehicle's specific top case rack. The Monolock® system is designed for light vehicles, scooters, and small-displacement motorcycles, with a maximum load of 3 kg.

Perfect for

Those who use their scooter to commute and don't want the usual black plastic top case. The natural aluminum changes the look of the vehicle, and forty liters is the right size for everyday life: two helmets when you park, groceries when you return, a backpack and helmet when you head to the office. It opens by pressing, detaches with one hand, and remains in top condition even after the tenth winter.

Frequently Asked Questions (FAQ)

Which scooter or motorcycle does the KMX400A mount on?
It is universal. The Kappa catalog provides it complete with a Monolock® plate and universal mounting kit, so there is no list of compatible models nor a mounting kit to buy separately. You just need a vehicle prepared to receive a Monolock® plate, usually on the rear rack.

How much can I load inside?
The maximum load declared by Kappa is 3 kg. This is not a limit of the top case but of the Monolock® system, designed for light vehicles: it supports lower loads than Monokey® in exchange for much lower weight and bulk. Respecting this protects the plate and your vehicle's subframe.

Do two helmets really fit?
Kappa claims two demi-jet helmets fit within the 40 liters of the KMX400A. The result, however, depends on the brand and model: shells vary significantly in size, and a large demi-jet can take up the space of one and a half. With just one helmet, including full-face ones, there is still useful space left.

How does the CRABLOCK closure work?
It is a direct-pressure closure, different from the classic Monolock® lock. You turn the key, and the lid lifts slightly on its own, allowing immediate opening. To detach the top case from the plate, an internal knob is used, which only works when the lid is already open.

What is the difference between KMX400A and KMX400B?
Only the finish. The KMX400A is in natural aluminum, the KMX400B is in matte black painted aluminum with the interior left in natural aluminum color. Dimensions, capacity, maximum load, CRABLOCK closure, and the included plate and universal kit are identical on both versions.

Are there accessories and spare parts for this top case?
Yes. The 2026 Kappa catalog features optional accessories including the K645 polyurethane backrest, the E161K internal elastic net, and the KS350 Adventure Straps. Spare parts include the lid, base, hinge, release system, attachment tooth, gasket, logo, and internal lining.