The Mini is designed to fit mass-market paperback books; this size is also ideal for e-readers such as Kindle, Kindle Paperwhite, Kindle Oasis, and iPad Mini. This size measures approximately 10x7.5 inches. The Mini DOES NOT include a front pocket.
The Midi perfectly accommodates a paperback book, up to 350 pages. This size measures approximately 11x8.5 inches. The Midi features a front pocket.
The Biggie perfectly accommodates a hardback or 1-3 paperback books. Book of the Month books, up to 450 pages, fit very nicely. This size measures approximately 13x9.5 inches. The Biggie features a front pocket.
All book sleeves are size tested with my collection to ensure satisfaction and fitting before packaging and shipping.