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Otona Randosel Bag Cefn by Tsuchiya Kaban Co., Ltd.
Otona Randosel Bag Cefn by Tsuchiya Kaban Co., Ltd.
Otona Randosel Bag Cefn by Tsuchiya Kaban Co., Ltd.
Otona Randosel Bag Cefn by Tsuchiya Kaban Co., Ltd.
Otona Randosel Bag Cefn by Tsuchiya Kaban Co., Ltd.

Platinwm Ategolion · 2026

Otona Randosel Bag Cefn

by Tsuchiya Kaban Co., Ltd.

  • Gwobr Blatinwm A' Design Award 2026 in Ategolion
  • CLIENT: Tsuchiya Kaban Co., Ltd.
  • Estimated Number of Design Views: 924,743
  • Verification code C8FCD5BD73 · Verify this award
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About Otona Randosel Bag Cefn

Mae'r bag cefn hwn yn ailddychmygu'r Randoseru Japaneaidd traddodiadol ar gyfer defnydd dyddiol. Trwy gael gwared ar ei fflap nodweddiadol, mae'r dyluniad yn cynnwys amlinell wedi'i chreu o linellau syth a chromliniau. Mae'r panel cefn ergonomig wedi'i strwythuro i ddarparu cymorth tra'n cynnal ymddangosiad ffurfiol. Mae'r tu allan wedi'i symleiddio trwy gael gwared ar bocedi, ac mae'r agoriad wedi'i ailddylunio ar gyfer mynediad hawdd. Nod y bag cefn hwn yw cydbwyso ffurf â defnyddioldeb ymarferol.

About the Gwobr Blatinwm A' Design Award

Mae Otona Randosel Bag Cefn yn enillydd Gwobr Blatinwm A' Design Award, cydnabyddiaeth hynod fawreddog a roddir i ddyluniadau gwirioneddol eithriadol, cain a godidog. Mae enillwyr Platinwm yn rhyfeddodau creu, yn dystiolaeth i derfynau creadigrwydd deallusol, ac yn dangos proffesiynoldeb ac athrylith diguro eu dylunwyr. Disgwylir i'r dyluniadau hyn fod y gweithiau enwocaf sydd yn diffinio estheteg oes, yn cyfrannu at les cymdeithas ac yn gwthio ffiniau celf, gwyddoniaeth, dylunio a thechnoleg. Mae Otona Randosel Bag Cefn yn arddangos lefel drosgynnol o ragoriaeth ac yn gwneud y byd yn lle gwell yn ddiamau gyda'i nodweddion manteisiol a gwerthfawr. Mae Otona Randosel Bag Cefn yn waith buddugol Gwobr Blatinwm A' Design Award sydd yn deffro dyheadau, yn ysbrydoli, yn cyffroi, yn swyno ac yn cynnau llawenydd mawr.

Press Kit

Unique Properties
Reimagining Randosel features for modern daily life.
This backpack reconstructs the "beauty of straight lines and curves" unique to Japanese Randosel. By removing the iconic flap, we achieved a minimalist silhouette defined by clean lines. Ergonomic curves on the back ensure comfort, balancing formal tension with utility. We eliminated external pockets to increase purity while redesigning the opening for smoother access. Disciplined beauty and modern convenience are highly fused.
Dimensions & Packaging
Size: H 410 × W 295 × D 120 mm
Shoulder Strap Length: 670-880 mm (7-level adjustment)
Handle Height: 35 mm
Tags
RANDOSEL, Backpack, Leather, Japan, Minimalist, Craftsmanship, Repairable
Production Technology
We developed a unique magnet for smooth operation and secure closure. Based on children’s Randosels-curves, we tested 4 shapes and 3 lengths, refining the fit through trials with over a dozen people. We also inherited the "soft touch" technique of Randosel by slightly extending the side cushioning.
For the lower back, a three-layer sponge supports weight on the hips. By incorporating the traditional airflow channel design into the back panel, we significantly improved daily comfort.
Design Challenge
Our challenge was to overturn the stereotype of "RANDOSEL equals a children’s bag" by reinterpreting it as a backpack with formal dignity. We achieved refined form and rational structure by fusing our founding Randosel techniques with top-tier craft, such as Dulles bag manufacturing and repair expertise. Working closely with our craft people, we thoroughly examined core materials, hardware, and aging quality, completing a unique product that integrates safety and durability with beauty.
Research
Inheriting and updating design and technology rooted in the Randosel.

Since our founding in 1965, we have inherited our craft while updating it for modern life. We thoroughly examined structure and specifications, focusing on flap operation, formal refinement, and carrying comfort. Beyond aesthetics, we pursued practical weight reduction and accessibility. Staying true to our brand spirit, we optimized the "OTONA RANDSEL" for daily use, achieving a fusion of beauty and functionality.
Inspiration
This project is based on the craftsmanship of the "RANDOSEL"-a traditional Japanese school bag-honed since our founding in 1965. We reconstructed the model launched for our 50th anniversary, evolving it into a backpack for a modern daily lifestyle. While inheriting the elegance, carrying comfort, and robust box-shaped structure, we pursued refined functional beauty to create an iconic model to be appreciated not only in Japan but also in the international market.
Project Duration
Started in July 2019 at Tsuchiya Kaban in Tokyo. Mass production was completed at the Tsuchiya Kaban workshop in June 2023, marking the end of the project. It is currently not for sale.
Operation Flow
Elevating the backpack into a dignified form suitable for formal settings.
By reinterpreting the Randosel’s neat structural beauty, we elevated the casual backpack into a dignified form. We added asymmetrical details to the orderly boxy form to create a presence that stands out in daily life. With center-of-gravity design and structure, we balanced a beautiful silhouette with high-performance comfort. This new commuter backpack integrates casual style and dignity, enhancing the wearer’s posture.

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