A product and system of notebooks that are color-coded to relate to a particular class or subject. For example, a green notebook could relate to a computer class, a red notebook could relate to compounds' molecular structure, etc. The notebooks are fashioned to employ different calligraphy (first, second, third, quadrille 5 mm, 6 mm, 7 mm and regular lines). As presently contemplated, the notebooks will be available in different, bright colors. By way of illustration and not as a limitation, the constituents may be incorporated into a different color-coded product.

A bookmark belt structure includes a bookmark belt, a clip member, a hanging member, and a decoration member. The bookmark belt is in the form of an elongated strip. The clip member includes a plate. One end of the plate has a turning portion extending in an opposite direction to form a clip piece. A slit is formed between the clip piece and the plate. One end of the bookmark belt is bound to the clip member. One end of the hanging member is connected to the other end of the bookmark belt. The decoration member is attached to the clip member. Through the aforesaid structure, the clip member may be used to clip the cover page or the inside page of a book so that one end of the bookmark belt is connected with the book to prevent the bookmark belt from being lost or slipping off.

An adjustable strap, comprised of four straps, which fastens on the spine of the book using a fitting mechanism. The second strap, comprised of three straps, is comprised of one strap made of elastic material that is inserted in the middle of the book pages. The second strap is fastened to the second end of the first strap and the first end of the third strap which wrap around the spine of the book and fastens through the fitting mechanism, making the strap as a whole, adjustable to fit different sized books. The fourth strap, acting as the bookmark(s), is attached to the first strap so it/they can be inserted between a single page or multiple pages to mark a place in a book. The bookmark is adjustable to fit different sized books and stays securely attached until removed and placed on another book.

A repositionable medium includes a base, a paper, and a first repositionable adhesive. The base has a top surface, a bottom surface, a first end edge, and a second end edge. The paper is fixedly coupled to the top surface of the base proximate to the first end edge. The paper has an inner edge and an outer edge. The outer edge is closer to the first end edge than the inner edge is to the first end edge. The inner edge is spaced a first distance from the first end edge of the base. The first repositionable adhesive is fixed to the bottom surface of the base and is not present in a first low adhesion area at a line across a width of the base and spaced a second distance from the second end edge of the base. The second distance equals the length of the first distance.