A sheet package comprising: a stack of sheets as print media for a printer; a package member covering the exterior of the stack of sheets, and a belt-shaped member wound around the package member, wherein said belt-shaped member is intended to be removed before loading the sheet package into a sheet storage unit of the printer, characterised in that the package member includes a first portion covering one of upper and lower faces of the stack of sheets, a second portion connecting with the first portion and covering a side face of the stack of sheets, and a third portion connecting with the second portion and covering the other of the upper and lower faces of the stack of sheets, wherein the first and third portions (51, 53) are connected to each other only via the second portion, and the first portion of the package member includes a first exposing portion exposing part of the stack of sheets to allow entrance of a sheet feed roller of the printer, and the package member includes a second exposing portion exposing a first side part of the stack of sheets and a second side part of the stack of sheets, the first side part is configured to face a pressing member (61, 64) provided to a side wall of the sheet storage unit of the printer parallel to a sheet feed direction, the pressing member (61, 64) being configured to press the stack of sheets against an opposite side wall of the sheet storage unit parallel to the sheet feed direction, so that the second side part is aligned along the opposite side wall of the sheet storage unit of the printer, and the removable belt-shaped member is wound around the package member in a direction perpendicular to the sheet feed direction. a stack of sheets as print media for a printer; a package member covering the exterior of the stack of sheets, and a belt-shaped member wound around the package member, wherein said belt-shaped member is intended to be removed before loading the sheet package into a sheet storage unit of the printer, characterised in that the package member includes a first portion covering one of upper and lower faces of the stack of sheets, a second portion connecting with the first portion and covering a side face of the stack of sheets, and a third portion connecting with the second portion and covering the other of the upper and lower faces of the stack of sheets, wherein the first and third portions (51, 53) are connected to each other only via the second portion, and the first portion of the package member includes a first exposing portion exposing part of the stack of sheets to allow entrance of a sheet feed roller of the printer, and the package member includes a second exposing portion exposing a first side part of the stack of sheets and a second side part of the stack of sheets, the first side part is configured to face a pressing member (61, 64) provided to a side wall of the sheet storage unit of the printer parallel to a sheet feed direction, the pressing member (61, 64) being configured to press the stack of sheets against an opposite side wall of the sheet storage unit parallel to the sheet feed direction, so that the second side part is aligned along the opposite side wall of the sheet storage unit of the printer, and the removable belt-shaped member is wound around the package member in a direction perpendicular to the sheet feed direction.