We introduce SEIL-bag Sling by Leemyungsu Design Lab

Message Signal Backpack, SEIL bag


Newly designed SEIL bag Sling which was released in 2018, has achieved huge quality improvement and more complete, by collaborated with fashion bag maker ‘GEAR3’, and IoT technology company ‘Groorumlabs’

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.
30~42mm(w) x 48mm(h) x 13mm(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.
32mm(w) x 44mm(h) x 22mm(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.
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 / Product Design

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


02 / UX 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 / Software Development

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.

Type Retail Price Size Volume / Weight Material Remarks
SEIL bag Rolltop US$300 30~42mm x 48mm x 13mm 24 L / 1kg Coated canvas, Mesh Nylon International shipping costs are separate.
SEIL bag Original US$310 32mm x 44mm x 22mm 20 L / 800g Coated canvas, Mesh Nylon International 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.

We have special collaborations
between IoT tech, fashion, and design.

Who we are

We had a special meeting with fashion bag maker ‘GEAR3’, and IoT technology company ‘Groorumlabs’.
GEAR3 transformed SEIL bag into simple design with well-balanced practical space and durability,
Groorumlabs created signal communication system by adding the most convenient and easy to use functions for riders into App and LED matrix.

  • Leemyungsu Design Lab Design

    Leemyungsu Design Lab develops innovative and smart wearable products which combined with people oriented design and technology. We provide value to customer by Identifying customer pain points and unmet needs with inspired design thinking.

  • GEAR3 Fashion

    The inspiration of GEAR3 has come from machines. They are made to fulfill their own purposes, which leads them to have specific shapes. Based on the fact, GEAR3 focuses on three key traits that machines have Simplicity, Functionality, Style. Every design of GEAR3 contains these traits, maintaining good balance.

  • Goorumlabs IoT Technology

    Goorumlabs is IoT related software based hardware startup. They consist of software and hardware research personnel, have equipment to develop various prototyping. They are also developing IoT-related devices, firmware, applications and server infrastructure directly.

+82 2 334 8771

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

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