7-9L

Volume

890g

Weight

4Magnetic dots

Fastening

290×230×170mm

Dimensions

Identification

Brand

LOBOO

Model

BTB15BK

Expandable magnetic tank bag

Capacity and measurements

Base volume

7

Closed configuration

Maximum volume

9

Open expansion joint

Dimensions

290 × 230 × 170

Quotes declared from manual measurement

Weight

890

Bag without ring

Materials

Composition

Nylon 52% · Polyurethane 37% · EVA 11%

Fabric

Double-thread 2520D ballistic nylon

Chosen for abrasion resistance

Hinges

Custom SBS

Zippers that can be used with gloves

Fastening

System

4 magnetic points with 4 spring-loaded teeth

The mechanical block is the actual restraint.

Interface

Adapter ring on the fuel tank cap

Not included, must be ordered separately

Adjustment

Sliding base forward and backward

With locking buckle, no tools required

Stated delivery times

1st hook-on · 2nd unhooking

Release by pulling the auxiliary strap

Protection

Rain cover

Included, one-piece

Background

Waterproof coating and rubber strips

IP rating

Not stated by the manufacturer

Equipment

Compartments

Mesh pocket under the lid and external front pocket

Reflective strips

On both sides

Data declared by LOBOO on the BTB15BK specifications sheet. The tank ring is sold separately: verify the brand, model, year, and cap type before purchasing.

The largest in the magnetic range: 9 litres with a sliding base and two-second release

All you need to know before ordering

Technical specifications, equipment, delivery, and warranty: find every detail, verified against official LOBOO documentation, below.

Description LOBOO BTB15 – Expandable Magnetic Tank Bag from 7 to 9 L

The LOBOO BTB15BK tank bag starts at 7 liters and expands to 9 by opening the expansion zipper. It measures 290 × 230 × 170 mm and weighs 890 g: it is the largest tank bag in the LOBOO range, designed for touring and more than just the daily commute.

Four magnets and four spring-loaded teeth

The base attaches magnetically at four points to the ring mounted on the tank cap: bring the bag close and it aligns itself, without having to center it by eye while wearing gloves. However, it is not the magnets that hold it in place, but four spring-loaded teeth that snap into position and lock it mechanically.

To detach it, pull the auxiliary quick-release strap and lift: LOBOO states that it takes one second to mount and two seconds to remove. At the fuel station, you can take it off without getting off the motorcycle.

The base slides back and forth

Lift the base quick-release fastening buckle, move the magnetic plate forward or backward to the correct position, and close the buckle again. No tools required. It is the same adjustment as on the BTB10, and it matters even more on a 9-liter bag: if the handlebar touches the bag with the steering fully turned, move the base backward instead of giving up the bag.

The mounting ring is required

The bag does not attach directly to the tank and does not use straps: it attaches to an adapter ring screwed to the fuel cap, sold separately and specific to the make, model, and cap type. Use the selector at the top of this page to find the correct code and add it to your order.

LOBOO documents four types of ring: circular, circular with reverse mounting, shaped, and with 3M adhesive. The type depends on your motorcycle's fuel cap and is already determined by the code returned by the selector.

Pay attention to models with two different caps depending on the configuration, such as the Honda NX 400 and NX 500 with 5- or 7-hole rings: count the screws before ordering.

2520D ballistic nylon

The fabric is a double-thread 2520D ballistic nylon, a weave used where abrasion resistance matters. The stated composition is 52% nylon, 37% polyurethane, and 11% EVA: the latter is the material of the shaped upper shell, which maintains its form even when the bag is full.

The sides feature high-reflectivity strips. They do not replace a high-visibility vest, but they add a luminous surface at the height of the headlights of oncoming traffic.

Everything separated inside

The lid opens onto a zippered mesh pocket for keys and documents. The main compartment holds a water bottle, gloves, and a balaclava, while the front has a dedicated external pocket for a neck warmer or power bank. The pulls on the custom SBS zippers are sized to be gripped while wearing winter gloves.

Rain

The bottom has a waterproof coating with rubber strips that stop water rising from the tank. For prolonged bad weather, the package includes a one-piece rain cover: it slips over the bag without elastic straps that need to be attached at four points.

LOBOO does not declare an IP rating for this bag. In a downpour, the cover provides the protection, and it should be fitted before the rain starts falling heavily.

Technical specifications

Product code BTB15BK
Volume 7 L closed · 9 L expanded
Dimensions 290 × 230 × 170 mm
Weight 890 g
Materials 52% nylon · 37% polyurethane · 11% EVA — 2520D ballistic nylon
Mounting 4-point magnetic attachment with 4 spring-loaded teeth, on tank ring
Adjustment Base slides forward/backward
Installation times 1 second to attach · 2 seconds to detach
Mounting ring Not included, specific to motorcycle model
Zippers Custom SBS
Rain protection One-piece rain cover included · no IP rating declared
Color Black

Which one to choose from the range

All LOBOO tank bags use the same magnetic attachment on a ring; the volume and base vary. The 2.5–3.5 L BTB05 has a fixed base and can be worn as a waist bag. The 4.5–6.5 L BTB10 and the 10 L BTB12 share the sliding base with this model. If you already have the ring installed, you can move any of these bags to the same motorcycle.

Why buy from Endurrad

Endurrad specializes in accessories for adventure and touring motorcycles. If your motorcycle does not appear in the selector, send us the make, model, and year: we will check with LOBOO before you order.

Why choose it
  • Variable volume 7-9 L: the largest tank bag in the LOBOO range, compact for daily use and spacious for travel.
  • Four spring teeth: it's not the magnet that holds it, but a mechanical lock that snaps into place.
  • Sliding base: if the handlebars touch when the steering is fully turned, slide the base back instead of foregoing the bag.
  • Two seconds to remove it: pull the strap and lift, without getting off the motorcycle.
  • 2520D ballistic nylon: weave chosen for abrasion resistance, where the bag rubs against your jacket and knees.
  • Weather protection: one-piece rain cover included and customized SBS zippers.
Who is it recommended for

It's the right choice if:

  • You need the maximum volume in the tank bag range: 9 litres expanded
  • You have a plastic tank where a classic magnetic bag won't hold
  • You already have a LOBOO ring mounted, or are willing to install it just once
  • You alternate between commuting and touring and want a volume that adapts to the day

It's not for you if:

  • You don't want to mount anything on the tank cap: no LOBOO tank bag uses straps, they all require the ring
  • You have a compact motorcycle: 290 × 230 × 170 mm is a lot on a short tank. Consider the BTB10 (4.5-6.5 L) or the BTB05 (2.5-3.5 L)
  • You are looking for a waterproof seal: LOBOO does not declare an IP rating, protection is provided by the rain cover
Documents and manufacturer

Assembly and checks

  • The tank bag attaches to an adapter ring mounted on the fuel cap. The ring is sold separately and is specific to the brand, model, and type of cap.
  • LOBOO documents four types of rings: circular, inverted mount circular, shaped, and with 3M adhesive. The correct type is determined by the code returned by the selector.
  • Screw mounting: remove the original cap screws, insert the aluminum bushings supplied with the ring, and re-tighten according to the torque specifications provided by the motorcycle manufacturer.
  • Bases with 3M adhesive do not require touching the screws: degrease the cap with alcohol, align the three reference points, and press down.
  • After assembly, check the steering radius at full lock on both sides, with the bag closed and then expanded. If necessary, move the sliding base back.
  • Accessory not subject to homologation. LOBOO does not declare any IP protection rating for this tank bag.

How does it work, in detail?

Four magnets guide, four spring-loaded teeth hold it in place

Four magnets guide, four spring-loaded teeth hold it in place

The magnetic attraction works on four points: bring the bag close to the ring and it aligns itself, so you don't have to center it by eye while wearing gloves. But the magnet isn't what keeps it in place.

Underneath, four spring-loaded teeth snap into place and mechanically lock the bag. The magnet guides the attachment; the teeth ensure that nine liters stay where you put them, even on rough terrain.

One second to put it on, two to take it off.

One second to put it on, two to take it off.

To mount it, place it on the adapter base and the magnetic mechanism does the rest. To detach it, pull the auxiliary quick-release strap and lift: LOBOO’s stated times are one second and two seconds.

In practice: at the gas station, remove the bag without getting off the motorcycle or undoing anything. It’s the difference you notice by the third fuel stop of the day.

The base slides until it no longer touches the bag

The base slides until it no longer touches the bag

Lift the quick-release base fastening buckle, slide the magnetic plate forward or backward into the right position, and close the buckle again. No tools needed; do it with the motorcycle stopped in one minute.

On a nine-liter bag, this adjustment determines whether you’ll use it or not. Turn the handlebars fully to both sides after installation: if they touch, move the base back instead of sending it back.

Keys and documents kept separate from the rest

Keys and documents kept separate from the rest

The lid opens to reveal a zipped mesh pocket, keeping keys and documents within reach instead of letting them sink to the bottom. The main compartment holds a water bottle, gloves, and a balaclava; the external front pocket stores a neck warmer or a power bank.

With seven litres of capacity, the organization is not a minor detail: it is what keeps you from emptying everything onto the tank to find the registration document.

2520D ballistic nylon with strips that are visible at night

2520D ballistic nylon with strips that are visible at night

The fabric is 2520D double-thread ballistic nylon: the weave used where abrasion resistance matters. On a tank bag that rubs against your jacket and knees every time you brake, it is exactly what you need. Declared composition: 52% nylon, 37% polyurethane, 11% EVA.

The highly reflective strips are positioned on the sides, catching the headlights of approaching vehicles at an intersection. They do not replace a high-visibility vest, but add light where it is needed.

One-piece rain cover, already included in the package

One-piece rain cover, already included in the package

The cover is a single piece: simply slip it over the bag, with no elastic straps to attach at four points while it’s raining. The bottom has a waterproof coating with rubber strips that stop water rising from the tank.

The zippers are custom SBS zippers—the kind that don’t start sticking after one season. Let’s be clear: LOBOO does not claim any IP rating. In a downpour, the cover provides the protection, and it should be put on before the rain starts coming down heavily.

Circular ring: the most common mounting method

Circular ring: the most common mounting method

Remove the original filler cap screws, insert the supplied aluminum bushings, position the ring with the opening facing the rear of the motorcycle, and screw it back on. The original filler cap trim ring goes back on top, with the holes aligned.

It only takes a few minutes, requires no drilling, and is completely reversible. Once installed, it stays in place: from then on, the bag attaches and detaches in a second.

Reverse mounting, when the ring goes on top

Reverse mounting, when the ring goes on top

On some caps, the ring goes above the collar rather than underneath it: position the bushings, place the ring on top, and screw it back on. Then the cap’s collar returns to its position above the ring without aligning the holes.

Only the sequence changes, not the difficulty. The code returned by the selector already determines which of the two procedures is required for your motorcycle.

Not all caps have the screws arranged in a circle.

Not all caps have the screws arranged in a circle.

On various motorcycles, the bolt pattern around the cap is not circular, so LOBOO produces shaped rings that follow its profile. The assembly sequence remains unchanged: remove the original bolts, place the aluminum bushings in the seats, fit the ring on top, and screw it back on.

The magnetic attachment to the bag is identical across the entire range; only the side facing the tank changes.

Some bases are glued on, not screwed on.

Some bases are glued on, not screwed on.

There is also a base with 3M adhesive for caps where it is best not to disturb the hardware. Degrease the cap with an alcohol-soaked cotton pad, align the three reference points printed on the base, and press down.

There are no screws to undo, but cleaning the surface becomes the crucial step: the adhesive is what supports the bag’s load.

How much space does it really take up on the tank?

How much space does it really take up on the tank?

At 290 × 230 × 170 mm, it’s the largest in the LOBOO tank bag range—and it shows. Once mounted, it stays gathered around the fuel cap without reaching the windscreen, but on a compact motorcycle it takes up a substantial part of the tank.

Before ordering, look at your tank and ask yourself whether twenty-nine centimeters will fit. If you’re unsure, the 4.5–6.5 L BTB10 uses the same mounting system with a significantly smaller footprint.

FAQs

For more information, please see our FAQ.

Is the mounting ring included?

No, and that’s essential: this bag does not use straps. It attaches magnetically to an adapter ring screwed onto the fuel cap, specific to the make, model, and type of cap. It cannot be mounted without the ring.

Use the selector at the top of this page to find the correct code and add it to your order. This is the most important check before purchasing.

How do I know which ring I need for my motorcycle?

Select the make and model in the selector on this page: it will show you the corresponding LOBOO code, price, and button to add it to your cart.

Watch out for models with two different caps depending on the trim, such as the Honda NX 400 and NX 500 with 5- or 7-hole flanges: count the screws around the cap before ordering.

Do the magnets also stick to plastic tanks?

Yes, because the magnets do not work against the tank but against the metal ring screwed onto the cap. The tank material is irrelevant: metal or plastic, the result is the same.

That is the difference compared with traditional magnetic bags, which simply do not stay in place on a modern adventure bike with a plastic tank.

How much does it really hold?

Closed, it holds 7 liters: a water bottle, gloves, a balaclava, a neck warmer, documents, and a phone, with keys and cards kept separately in the mesh pocket under the lid. Unzipping it expands the capacity to 9 liters, leaving room for a rain jacket or a compact camera.

It is the largest capacity in the LOBOO tank bag range. For travel luggage, you will still need rear or side bags.

How do you go from 7 to 9 liters?

I open the expansion zipper on the lower panel: the bag gains height and recovers two liters. The operation is reversible at any time, even with the bag mounted on the motorcycle.

In everyday use, you keep it closed to minimize bulk; on the day of departure, you open it.

Can I move the bag forward or backward on the tank?

Yes, and it’s the most important adjustment on this bag. Lift the quick-release base fastening buckle, slide the magnetic plate forward or backward, and close the buckle again. No tools required.

It’s especially useful on motorcycles with a short tank: if the handlebar touches the bag when turned fully, move the base backward instead of giving up.

At 290 mm, isn’t it too large for my motorcycle?

It is the largest in the LOBOO tank-bag range: 290 × 230 × 170 mm. It fits comfortably on a maxi enduro, while on a compact motorcycle it takes up a good part of the tank. Before ordering, check yours and make sure there is room for twenty-nine centimetres.

If you are unsure, the 4.5–6.5 L BTB10 uses the same ring and mounting system, with a significantly smaller footprint.

Is it waterproof?

It is not waterproof, and LOBOO does not claim any IP rating. The bottom has a waterproof coating with rubber strips that stop water rising from the tank, and the zippers are custom SBS zippers.

For bad weather, the package includes a one-piece rain cover that slips over the bag without any elastic straps to attach. It should be put on before heavy rain begins, not afterward.

Does it damage the tank’s paint?

The load is carried by the ring screwed onto the cap, so the bag does not rub against the paint as a traditional magnetic bag would, and there are no straps running under the seat to mark the side panels.

The remaining risk is sand collecting between the base and the tank: clean the area before attaching it, especially after riding on dirt roads.

Do I need to get off the motorcycle to remove it?

No. You pull the quick-release auxiliary strap and lift: LOBOO claims two seconds, and you can do it while remaining seated. To put it back, place it on the base and the magnets align it automatically.

At the pump, it means opening the cap without dismantling half the motorcycle, which isn’t possible with a strap-mounted bag.

Is the ring visible when the bag isn’t attached?

Yes: it remains screwed onto the tank cap even when the bag is removed. It is a flat black-colored component that is relatively unobtrusive, but if you want a completely clean-looking motorcycle when you are not using the bag, this is the compromise to bear in mind.

The installation is reversible, though: reinstall the original screws and the motorcycle returns to its original condition.

Is one ring enough for all LOBOO tank bags?

Yes, the magnetic mount is identical across the entire range. Once the ring is installed, you can use the BTB05, BTB10, BTB12, or this one interchangeably on the same motorcycle, choosing the capacity based on the day.

If you have two motorcycles compatible with different ring codes, a second ring lets you move the same bag from one to the other.

What’s the difference compared with the BTB10 and BTB12?

The attachment is the same on all three: magnetic to the ring, with a sliding base. The volume and structure differ. The BTB10 ranges from 4.5 to 6.5 L and is the most compact; the BTB12 has a fixed 10 L capacity with a semi-rigid structure; this is the expandable one, from 7 to 9 L.

If you already have the ring installed, you can switch between them on the same motorcycle without buying anything.

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