Otona Randosel Officium Primarium: Pera Dorsualis ab Tsuchiya Kaban Co., Ltd.

Opus Otona Randosel Officium Primarium: Pera Dorsualis a designatore Tsuchiya Kaban Co., Ltd. est victor maxime honoratus praemii praestigiosissimi 2026 Praemium A' Design Award Platinum in Categoria Certaminis Accessorium.

PlatinumAccessorium· 2026

Otona Randosel Officium Primarium: Pera Dorsualis

a Tsuchiya Kaban Co., Ltd.

Cliens: Tsuchiya Kaban Co., Ltd.

Victor praemii Praemium A' Design Award Platinum in Categoria Accessorium

943,134

Victor Praemii Verificatus

Verifica Statum Praemii pro #180952

Visita Situm Vide apud A' Design Award Communicatum Insigne Praemii

Colores

Designum

De Otona Randosel Officium Primarium: Pera Dorsualis

Haec pera dorsualis Randosel Iaponicum traditionale ad usum cotidianum denuo excogitat. Operculo proprio remoto, consilium adumbrationem ex lineis rectis et curvis compositam exhibet. Tabula posterior ergonomica ita structa est ut fulcimentum praebeat dum aspectum formalem servat. Exterior ope marsupiis sublatis simplicior redditur, et apertura ad facilem aditum denuo formatur. Haec pera dorsualis formam cum utilitate practica aequare studet.

Agnitio

De Praemium A' Design Award Platinum

Otona Randosel Officium Primarium: Pera Dorsualis victor est Praemii A' Design Award Platinum, honoris amplissimi formis vere eximiis, elegantibus et magnificis dati. Victores Platini miracula creationis sunt, testimonia finium ingenii inventivi, et industriam inaequabilem auctorum suorum ostendunt. Exspectatur has formas opera celeberrima fore, quae aetatis venustatem definiant, ad societatis salutem conferant et fines artis, scientiae, formandi et technologiae promoveant. Otona Randosel Officium Primarium: Pera Dorsualis excellentiam transcendentem exhibet et utilibus proprietatibus mundum meliorem reddit. Otona Randosel Officium Primarium: Pera Dorsualis opus est Praemio A' Design Award Platino victum, quod cupiditates excitat, animos incitat, delectat et magnum gaudium creat.

Post Designum

Fasciculus Nuntii

Merita, sodales gregis et singula technica a designatore praebita.

Proprietates Singulares: 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.
Dimensiones et Involucrum: Size: H 410 × W 295 × D 120 mm
Shoulder Strap Length: 670-880 mm (7-level adjustment)
Handle Height: 35 mm
Notulae: RANDOSEL, Backpack, Leather, Japan, Minimalist, Craftsmanship, Repairable
Technologia Productionis: 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.
Provocatio Designandi: 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.
Investigatio: 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.
Inspiratio: 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.
Duratio Operis: 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.
Cursus Operationis: 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.