Book envelopes are similar to book sleeves except they are side load and have a flap and button closure which encloses the book completely.
XL Measures 9"x11.5" is padded, and is perfect for those large hardbacks.
Standard Measures 8"x10.5" is padded, and is perfect for paperbacks, ARCs and smaller hardbacks.
Mini measures 6"x 8.5” is padded, and is perfect for cozy mystery paperbacks or kindle paperwhite, kindle voyage, nook, kobo touch and kobo mini.