A sketchbook, notebook and reference book in one, Sizes May Vary is a unique working tool for graphic designers and students. The sketchbook area provides space for sketching and visualizing, containing more than 200 pages of thumbnails and scale line drawings of commonly reproduced formats, including stationery sets, letterheads, business cards and compliment slips; envelopes, mailers and postcards; CDs and DVDs; jewel cases and digipacks; posters and billboards; and browser windows and banner ad spaces. A 16-page reference section provides essential information on a range of topics, from international paper sizes and digital formats to measurement conversion tables. Plain paper and graph paper, signature sheets and a notebook area offer extra space for ideas and thoughts.

Mark Boyce studied typography at the London College of Printing and since graduating has worked for several design agencies. His work includes print and interactive design, retail and exhibition environments and art direction for photography and moving image.