KNOX

knoxbrain is a product brand in stationery and organizer planners that originated from KNOX in 1985. As a core offshoot line developed while KNOX expanded its business from bags and leather goods into organizer planners, it offered an integrated range from planner covers to refills. In 2008, it revamped its product lineup and logo, forming a group of series spanning multiple materials, price ranges, and designs. It is a historical line that became the foundation of organizer-planner culture at KNOX today.

PEARCE is KNOX’s signature long-running series, introduced in 1993. It has featured system planners and leather goods made from vegetable-tanned buffalo calf leather, whose texture changes with use. It is a standard core line in KNOX’s lineup and occupies a heritage position that serves as the benchmark for related derivative lines such as N/PEARCE, PEARCE PREMIUM LINE, and PEARCE SHRINK.

TSUTSUMIKOMU is an original KNOX system planner series launched in 2004. It is characterized by a structure that wraps around the body and refills like a furoshiki, and has been developed as a line emblematic of KNOX’s craftsmanship, which makes use of the natural character of leather. Models with updated materials and specifications, as well as a mini size, were introduced for the 45th anniversary. Unlike AUTHEN and FLUCT, it is positioned as a distinctive line that foregrounds its structure.

UNITE was a series developed by KNOX, combining different color schemes for the exterior and interior, vivid inner colors, and a design that allows a belt to be threaded through. Unlike PEARCE’s classic standard design and ADRIA’s extensive range of colors, it made the contrast between leather colors a distinct design element. The official page indicates that some products have been discontinued, making it a historical line with a limited product range today.

Natural Tan Leather is a KNOX product series made with European cowhide leather that is 100% vegetable-tanned and finished individually by Japanese artisans. It presents the leather’s color change to an amber tone with use as a central value, and was developed as a line for enjoying the material’s aging process. While AUTHEN and FLUCT emphasize advanced construction and handcraft, this material-focused line centers on changes in the leather itself and Japanese-made craftsmanship. Official product pages indicate that some or all products have been discontinued.

ANTOLE is a leather series by KNOX whose name derives from “Antique + Together + Leather.” It applies oil treatment, uneven dyeing, and hand-applied shadow dyeing to supple chrome-tanned steer leather, extending an antique-style leather appearance across the products. Unlike PEARCE’s leather designed to develop a patina over time and JAPAN BLUE’s color theme, this line focuses on antique-style finishes and a broad range of leather goods.

ADRIA is a KNOX series characterized by the color of Italian leather and shrink embossing. In addition to system planners ranging from A5 to mini sizes, it offers items such as pen cases and ID cases, with a wide range of colors and a lineup suited to both work and private use. Compared with the higher-end craft lines AUTHEN and FLUCT, ADRIA is positioned as a practical line that emphasizes everyday use and a broad range of options.

ILBUTTERO is KNOX’s leather goods series made with Buttero leather from a tannery in Tuscany, Italy. The range centers on ring-bound planners with a structure that makes use of a single piece of leather and large-diameter rings that open fully flat, and also includes pen cases and card cases. While PEARCE is the standard line designed for enjoying the leather’s changes over time, ILBUTTERO is a function-oriented line focused on the leather’s color and the ease of writing afforded by its structure.

JAPAN BLUE is a leather product series developed by KNOX, combining leathercraft techniques with expressions of blue that evoke hon-ai indigo. Using its own dyeing technique and micro-check embossing, it presents a color theme and Japanese approach to material expression that differ from typical series centered on leather materials. Separate from flagship lines focused on handcraft, such as AUTHEN and FLUCT, it is positioned as a theme-based line that foregrounds indigo blue and Japanese leatherworking techniques.

PEARCE PREMIUM LINE is a high-end line derived from KNOX’s standard PEARCE series. It uses traditional buffalo calf leather for the exterior and Italian-made Arizona leather for the interior, emphasizing contrasts in materials and color. It shares PEARCE’s core design and approach, which assumes long-term use, while positioning itself as a premium derivative line with a higher-end material composition and price range than regular PEARCE.

AUTHEN is a series of top-tier models introduced in 2015 as KNOX’s flagship. Its products combine vegetable-tanned leather made from French hides, traditional Tokyo pigskin, and handwork by Japanese sewing artisans, with an emphasis on materials and processing. Unlike KNOX’s standard everyday models, it is the brand’s highest-end line, representing its craftsmanship and its highest standards in leather goods.

FLUCT is a series that KNOX announced in 2022 as its second flagship, following AUTHEN. Its name derives from a word meaning “fluctuation,” and it combines designs inspired by 1/f fluctuations with distinctive vegetable-tanned leather. A defining feature is that every step of the process is completed by hand. While AUTHEN focuses on bringing together materials and traditional techniques, FLUCT is a higher-end line that places greater emphasis on distinctive combinations of materials and original forms.

N/PEARCE is a new heritage line launched to mark the 30th anniversary of PEARCE, a long-selling KNOX product. While carrying forward PEARCE’s classical curves and timeless appeal, it updates its materials and construction around five elements: NEW, NOBLE, NATURAL, NICHE, and NUME. Rather than a lower-priced version replacing the original PEARCE, it is developed alongside PEARCE as a new standard line that carries the established classic into the next generation.

PEARCE SHRINK is a shrink-leather series derived from KNOX’s long-selling PEARCE. While retaining the timeless design of the original PEARCE, it uses heavy-tanned shrink leather and is offered in leather goods such as pen cases and business card holders. Rather than contrasting interior and exterior materials, as in PEARCE PREMIUM LINE, it explores the character and durability of the leather as a new point of focus, making it a material-variation subline of PEARCE.