Experiential Event for "Gadgetable DP2 4U" Featuring 4 Types of Shoulder Harnesses, Held for a Limited Time at Isetan Tachikawa Store

Ace Co., Ltd., a bag manufacturer, is holding a limited-time experiential event called "Harness Fit Lab" at Isetan Tachikawa Store from April 1st to April 7th, 2026. The event features the exclusive sale of the high-performance business backpack "Gadgetable DP2 4U," which allows users to choose from four types of uniquely developed "4U Harnesses" for a comfortable fit. Customers can receive fitting suggestions from staff and, on specific days, have their backs measured by the harness developer.
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  • 📰 Published: March 31, 2026 at 20:00
  • 🔍 Collected: April 1, 2026 at 13:39 (17h 39m after Published)
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Ace Co., Ltd. (Headquarters: Shibuya-ku, Tokyo; President: Hiroaki Morishita), a bag manufacturer, will be selling the high-performance business backpack "Gadgetable DP2 4U" from its bag & luggage brand "ace." exclusively at an event.

This model features a choice of four types of shoulder harnesses that can be fitted to the body, and will be available at the experiential event "Harness Fit Lab" * held at Isetan Tachikawa Store (Tachikawa City, Tokyo) from April 1st (Wednesday) to April 7th (Tuesday), 2026.

*Scheduled to be held sequentially at other department stores as well.

Image of Harness Fit Lab in progress

[About Gadgetable DP2 4U]

Brand: ace.

Model: Gadgetable DP2 4U

Size: H42×W30×D14(18)cm *Numbers in parentheses indicate values when the expandable function is extended.

Price (tax included): 62,700 yen

Main Material: Polyester 600dn high-durability PU surface

Sub Material: Nylon 840dn Oxford Shile processing/PU processing, Cowhide

Features:

"Gadgetable" is a high-performance business backpack born from the concept of "designing a comfortable commuting environment." Its slim design makes it less obtrusive even in crowded situations, and it offers an excellent balance of functionality, ease of use, and design.

The "Gadgetable DP2 4U" is a top-grade model made in Japan, meticulously sewn one by one by skilled Japanese craftsmen. The four types of "4U Harnesses," uniquely developed based on measurement data, provide a comfortable carrying experience.

[What is the 4U Harness?]

The "4U Harness" consists of four types of shoulder harnesses developed based on measurement data from various male monitors with different body types and builds.

Instead of visual elements like body shape or fleshiness, the four types—S (Slender), P (Power), B (Balance), and M (Max)—are classified by differences in back length and shoulder thickness, allowing you to choose the optimal shoulder harness shape for yourself.

* Wakauma Genta: Study on Shoulder Strap Shapes for Backpacks Suitable for Shoulders, Human Life Engineering, Vol.25 (2), pp. 44–49, 2024.

・S (Slender): For those with slender and compact shoulders.

・P (Power): For those with sturdy and thick shoulders.

・B (Balance): For those with average shoulders and height.

・M (Max): For those with a large build and thick shoulders.

[About the Harness Fit Lab]

Event Name: Harness Fit Lab

Duration: April 1st (Wednesday) to April 7th (Tuesday), 2026

Location: Isetan Tachikawa Store, 2nd Floor, The Stage

https://www.mistore.jp/store/tachikawa.html

Event Details:

At the experiential event "Harness Fit Lab," store staff will offer fitting suggestions for the "Gadgetable DP2 4U," and Dr. Genta Wakauma (Ph.D. in Engineering), the developer of the "4U Harness," will provide a limited-day service to measure and suggest fittings for customers' backs.

*Measurement and suggestion dates by backpack fitter: April 4th (Saturday) and 5th (Sunday)

*Measurement and suggestion date by developer: April 5th (Sunday)

*Staff may not be available depending on the date and time.

Ace Lab, Dr. Genta Wakauma (Ph.D. in Engineering)

1. Reduced Burden: Carrying the backpack in the correct position reduces the burden on shoulders and waist, supporting comfortable movement.

2. Improved Posture: Correct carrying posture naturally straightens the back, giving a stylish and healthy impression.

3. Discover Your Best Fit: Choosing a backpack that suits your body enhances the silhouette of your clothes and helps in future backpack selections.