2,5-3,5L

Volume

70mm

Handlebar-to-end-cap clearance

4Magnetic dots

Fastening

225×178×100mm

Dimensions

Identification

Brand

LOBOO

Model

BTB05SBK

Manufacturer SKU 10.4.04012.001.01

Capacity and measurements

Base volume

2,5

Collapsed configuration

Maximum volume

3,5

Open lower bellows

Dimensions

225 × 178 × 100

Closed. With the bellows open, it becomes 225 × 178 × 125 mm

Weight

Not stated by the manufacturer

No LOBOO source reports the weight of this code

Materials

Composition

Polyurethane, nylon, polyester fiber

Hinges

Custom YKK fasteners

Fastening

System

4 magnetic points with safety clips

Interface

Adapter ring on the fuel tank cap

Not included, must be ordered separately

Minimum handlebar-to-cap distance

≥ 70

Requirement stated by LOBOO

Protection

Rain cover

Included

Background

Water-repellent coating and rubber strips

IP rating

Not stated by the manufacturer

Use and equipment

Walking distance

Waist bag, strap included

Compartments

2 — main and front-facing

Cable gland

Yes, for a charging cable

Reflective strips

On both sides

Data declared by LOBOO on the BTB05BK parameter sheet. The tank ring is sold separately: verify brand, model, year, and cap type before purchasing.

Compact tank bag 2.5-3.5 L with magnetic quick release, can be worn as a fanny pack

All you need to know before ordering

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

Description Expandable magnetic motorcycle tank bag 2.5-3.5 L

The LOBOO BTB05SBK tank bag is a compact 2.5 L bag, expandable to 3.5 L by adjusting the gusset. It measures 225 × 178 × 100 mm when closed and 225 × 178 × 125 mm when expanded: it is designed for riders who want only the essentials within easy reach, not for touring luggage.

The base features four magnetic attachment points plus safety clips: it attaches and detaches in one second, with no straps to undo. The included strap converts it into a waist bag, so you can take it with you at the gas station or when parked without emptying it.

Key features

  • Adjustable capacity from 2.5 to 3.5 L, with a double compartment for separating documents and small items
  • 4-point magnetic release with a dual clip-mounting structure
  • Waist-bag use thanks to the included strap
  • Rain cover included, water-repellent coating on the base, and rubber strips to prevent water ingress
  • Customized YKK zippers
  • Reflective strips on both sides for night riding
  • Cable pass-through for charging your phone while riding

Requires a mounting ring

The bag does not attach directly to the tank: it attaches to an adapter ring mounted on the fuel cap, sold separately and specific to the make, model, and type of cap. Use the selector on the page to find the correct code for your motorcycle.

Two checks before purchasing: the distance between the handlebar mount and the fuel cap must be at least 70 mm, and installation is not recommended if you have moved the handlebar farther back than its standard position.

If you need more space for touring, consider the expandable 4.5–6.5 L or 7–9 L versions.

Why choose it
  • Quick release: four magnetic points and safety clip, no straps to unfasten with gloves.
  • Two products in one: the included strap transforms it into a fanny pack when you get off the motorcycle.
  • Adjustable volume: from 2.5 to 3.5 L by opening the bottom gusset, with two separate compartments.
  • Only 450 g: comfortable even when worn on foot.
  • Rain cover included: plus SBS zippers and water-repellent bottom with rubber strips.
  • Does not rub on the paint: the load is on the ring screwed to the cap, not on the tank.
Who is it recommended for

This is the right choice if:

  • You only need essentials within reach: documents, phone, keys, wallet
  • You make many short stops and want to take your bag with you without emptying it
  • You want minimal bulk on the tank and a clean line
  • You also ride at night and appreciate reflective strips

This is not for you if:

  • You are looking for travel capacity: 3.5 L is not enough for rain gear, a camera, or spare layers. Consider the 4.5-6.5 L or 7-9 L versions
  • You don't want to mount anything on the tank cap: the ring remains screwed on even when the bag is removed
  • You have moved the handlebars back or have less than 70 mm between the handlebar clamp and the cap
Documents and manufacturer

Assembly and Checks

  • The bag attaches to an adapter ring mounted on the fuel cap. The ring is sold separately and is specific to the make, model, and type of cap.
  • Minimum required distance from LOBOO between handlebar mount and fuel cap: 70 mm. Measure before ordering.
  • If the handlebar has been moved backward from the stock configuration, the manufacturer advises against installation.
  • Screw mounting: remove the original cap screws, insert the aluminum bushings supplied with the ring, and re-screw with the opening facing the rear of the motorcycle. Some shaped rings use 3M adhesive instead.
  • Check the steering radius at full lock with the bag mounted before departing.
  • Accessory not subject to homologation. LOBOO does not declare any IP protection rating for this bag.

How does it work, in detail?

One second to take it off, one second to put it back on

One second to take it off, one second to put it back on

The bottom of the BTB05SBK features four magnetic points alongside safety clips: it’s the dual mounting structure that LOBOO installs on quick-release tank bags. Place the bag on the ring and it aligns itself; lift it and it comes off. No straps to undo, no Velcro to pull apart, nothing to do while wearing gloves.

It’s the difference you notice at the gas station, where a traditional bag forces you to remove everything to open the fuel cap.

Get off the motorcycle and carry it on you.

Get off the motorcycle and carry it on you.

The included strap turns the bag into a proper waist pack, not a makeshift alternative. With a 225 × 178 mm base, it sits securely around your waist without swinging, and your documents stay where you put them.

For anyone making lots of short stops—a coffee, a visit, a walk around the city center—it’s the main reason to choose it over a classic tank bag.

From 2.5 to 3.5 liters, only when needed

From 2.5 to 3.5 liters, only when needed

On the lower section, a zipper opens a gusset: the bag expands in height and gains about a liter of capacity. Closed, it stays compact for the daily commute; open, it accommodates a rain jacket or a sweater taken off halfway through the day.

The adjustment can be made while riding, without removing the bag or using tools.

Two compartments, so you don’t have to rummage.

Two compartments, so you don’t have to rummage.

The main compartment holds lightweight gloves, a skullcap, or a neck warmer; the slimmer front compartment keeps documents, cards, and keys separate, complete with a keychain carabiner.

With a 2.5-liter bag, organization isn’t a minor detail: it’s what keeps you from emptying everything onto the tank to find the registration document.

Reflectors on the sides and cable hole

Reflectors on the sides and cable hole

The two highly reflective strips are positioned on the sides, where they really make a difference: they catch the headlights of anyone approaching from the right or left at an intersection. They do not replace a high-visibility vest, but add two points of light at tank height without compromising the look during the day.

On the same side, there is a cable pass-through: keep your phone or power bank inside the bag and run the cable out to the handlebar mount without leaving the zipper partially open.

The rain cover is already in the box.

The rain cover is already in the box.

The base has a water-repellent coating and rubber strips that stop water rising from the tank; the zippers are customized YKK. The dedicated cover slips on in seconds and stays compressed in a corner of the compartment when not needed.

Let's be clear: LOBOO does not claim any IP rating for this bag. In a downpour, the cover provides the protection—not the fabric alone.

The ring is installed only once

The ring is installed only once

The adapter ring must be purchased separately and is specific to your motorcycle. Installation is simple: remove the original filler cap screws, insert the supplied aluminum bushings, position the ring with the opening facing toward the rear of the motorcycle, and re-tighten the screws. Some shaped rings instead use 3M adhesive and do not require touching the screws.

Once installed, it stays there. From then on, the bag attaches and detaches in a second.

Not all caps have the screws arranged in a circle.

Not all caps have the screws arranged in a circle.

On various motorcycles, the cap’s bolt pattern is not circular, so LOBOO produces shaped rings that follow its profile. The installation sequence does not change: remove the original screws, 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 an adapter base with 3M adhesive for caps where it is best not to tamper with the hardware. Degrease the cap with an alcohol-soaked cotton pad, align the three reference points printed on the base, and press down.

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?

Mounted, it stays low and close around the cap, without reaching the handlebars or windscreen. It has the footprint of a 2.5-liter bag: you can ride without noticing it, even standing on the foot pegs.

Two measurements to take before ordering. LOBOO requires at least 70 mm between the handlebar mount and the fuel tank cap: below that distance, the bag interferes with steering at full lock. And if you have moved the handlebars farther back than the stock position, the manufacturer advises against installing it.

FAQs

For more information, please see our FAQ.

Is the retaining ring required? Is it included in the package?

It holds, and it is not included. The BTB05SBK does not attach directly to the tank: it connects magnetically to an adapter ring that must be installed once on the fuel cap. The ring is specific to the make, model, and cap type and is sold separately. Use the selector on the page to find the correct code for your motorcycle.

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

Select the make and model in the selector on this page: it will provide the corresponding LOBOO code and a direct link to the correct variant. Pay attention to cases where the same model has two different caps, such as the Honda NX400 and NX500, which may have 5- or 7-hole caps: count the screws on the cap before ordering.

Do the magnets also stick to plastic tanks?

The question doesn’t arise: the magnets don’t work against the tank, but against the metal adapter ring screwed onto the cap. That’s why the system also works on motorcycles with plastic tanks or tank coatings, provided an adapter ring is available for your model.

Can it also be used after getting off the motorcycle?

Yes. You can detach it in a second and wear it as a waist bag using the included strap: take it with you at the gas station or parking lot without having to empty it. With a 225 × 178 mm base, it remains comfortable to carry on foot.

How much does it really hold?

It’s an essentials bag, not a travel bag: 2.5 liters when closed and 3.5 when open, with external dimensions of 225 × 178 × 100 mm that become 125 mm high when the gusset is open. It fits documents, wallets, keys, phones, glasses, a pair of lightweight gloves, or a balaclava. It won’t fit a DSLR with a lens or a helmet.

Is it waterproof?

It is not waterproof, and LOBOO does not claim any IP rating. It has customized YKK zippers, a water-repellent coating, and rubber strips on the bottom to prevent water from seeping in from below, plus an included rain cover. The cover must be used in heavy rain: it is what ensures waterproofing, not the fabric alone.

How do you go from 2.5 to 3.5 liters?

I open the bellows zipper on the lower panel: the bag gains height and recovers about a liter. You can keep it closed for everyday use and open it only when you need it, without taking anything apart.

Does it interfere with the steering wheel or your knees?

LOBOO specifies a precise requirement: there must be at least 70 mm between the handlebar mount and the fuel tank cap. Measure before ordering. If you have moved the handlebar back from its standard position, the manufacturer does not recommend installation.

Does it damage the tank’s paint?

The load is carried by the ring screwed into the cap, so the bag does not rub against the paint as a traditional magnetic bag would. The remaining risk is sand accumulating between the base and the tank: clean the area before attaching it, especially after riding on dirt roads.

Can I run the phone’s charging cable through?

Yes, there is a dedicated cable pass-through: keep the power bank or phone inside the bag and route the cable out to the handlebar mount. The opening is not sealed, so when the rain cover is fitted, it should be closed or left facing downward.

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

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

Is one ring suitable for multiple motorcycles?

Each ring covers a group of models that share the same cap. If you have two compatible motorcycles with different codes, you can purchase a second ring and move the same bag from one to the other: the magnetic attachment is identical across the entire range of LOBOO rings.

What is the difference compared with the 4.5–6.5 L version?

The BTB05SBK is the smallest in the range: a rigid, shaped shell with a compact footprint, designed for essentials and to be worn as a waist pack. The 4.5–6.5 L is a travel bag: more capacity, more bulk on the tank, and less convenient to carry on your body. If you need room for rain gear or a camera, go up a size.

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