We introduce SEIL-bag Sling by Leemyungsu Design Lab

Message Signal Backpack, SEIL bag


Leemyungsu Design Lab is launching IT convergence product development and service for Urban Rider’s safety and style. Developed through continuous R&D since 2010, SEIL bag was a grand prize-winning innovative design product at the DFAA (Hong Kong Asia Design Awards) and won Red dot design, iF design. It started commercialization in 2017.
In 2019, we plan to introduce a new SEIL bag product with a more user-friendly and intuitive interface.

SEIL bag Rolltop

SEIL bag Rolltop

SEIL-bag Rolltop is a model with a straight but solid shoulder line. Front nylon mesh type pocket and the roll-up design changes the dull feeling of the plain front to Simplicity.
300~420mm(w) x 480mm(h) x 130mm(d), 24L, Black coated canvas & Mesh nylon

SEIL bag Original

SEIL bag Original

SEIL bag original keeps the shape of the original design. The black-coated canvas fabric was designed to create a dimensional curve that increases the volume, and flows the curve to the front pocket naturally.
320mm(w) x 440mm(h) x 220mm(d), 20L, Black coated canvas & Mesh nylon

App & LED Matrix

App & LED Matrix

A built-in LED matrix that can control signals via smartphone app allows you to transmit rider’s operating signals and short messages around you. SEIL BAG App: iOS, Android

LED Matrix: 125mm(w) x 80mm(h) x 13mm(d), 90g, Transparent ABS

A smart fashion item for the riders who enjoy Nomadic lifestyle. Matte black color matches a variety of styles including simple, casual, and/or formal look with functionalities and styles of the bike & personal mobility riders. The smartphone app allows you to display driving signals, and express your messages like ‘Thank you^^’.


SEIL bag of Lee Myung Su design lab won the global design awards including Red Dot design awards and IF design awards back in 2010 was a Hot Issue for domestic and foreign riders’ communities.

Our Process


01 / Development Concept Design

Leemyungsu Design Lab is dedicated in developing IT Fashion products based on Connect & Development (C&D) strategy and in relevant design process.


02 / Development Product Design

Leemyungsu Design Lab is dedicated in enhancing user satisfaction with a product by improving the usability, accessibility, and pleasure provided in the interaction with the product.


03 / R&D

Leemyungsu Design Lab is dedicated in creating and maintaining applications and frameworks resulting in a software product, guiding user to their desired destination safely.


04 / Collaboration & Partnership

Leemyungsu Design Lab always want mutually complementary cooperation to create value that appeals to consumers while maximizing the merits of their respective fields of expertise.

Simple design with a modern sense of European classic – SEIL bag Rolltop and also SEIL bag Original. Practical space for IT devices, strong durability and waterproof material make the perfect outdoor bag.
Choose your unique driving signals, or make your own short messages in your smartphone app to communicate with people from a distance through 135 Super Bright LED light source.
SEIL bag is a must item to complete your own swag.

Providing Safety, Functionality, and Style To Urban Riders By Just Wearing SEIL Bag.


It is easy to get crude design if you focus on safety too much, and it is also easy to lose the safety and functionality, if you focus on style too much. With SEIL bag, you can enjoy both safety, functionality and the style that could not be found in existing products.

TypeRetail PriceSizeVolume / WeightMaterialRemarks
SEIL bag RolltopUS$30030~42mm x 48mm x 13mm24 L / 1kgCoated canvas, Mesh NylonInternational shipping costs are separate.
SEIL bag OriginalUS$31032mm x 44mm x 22mm20 L / 800gCoated canvas, Mesh NylonInternational shipping charges are separate.

International Buyers – Please Note:

International shipping costs, import duties, taxes, and charges are not included in the retail price. These charges are the buyer’s responsibility.
Please check with your country’s customs office to determine what these additional costs will be prior to bidding or buying.


– We only provide a USB 3.0 cable for connecting to the LED matrix. We do not offer any portable charger or external battery packs for SEIL bag.
– SEIL bag can hold up to 15-inch notebook.
– SEIL bag can be waterproofed by using coated canvas fabric.
– LED Matrix is not waterproof, so do not put it in water or pour water.
– Please wipe lightly with a cloth or a towel as soon as the bag gets dirty.

Share the story of SEIL bag to urban riders.

Who we are

Leemyungsu Design Lab is developing SEIL bag products and services that integrate IT and fashion.

+82 2 334 8771

 2F, #88, Yeonmujang-gil, Seongdong-gu, Seoul, 04785, Korea

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