Pad (1; 101; 201; 401; 409; 501; 601; 701; 1003; 1103) for use in a coffee machine for preparing a beverage for obtaining at least one part of a single beverage serving which pad (1; 101; 201; 401; 409; 501; 601; 701; 1003; 1103), for use in the coffee machine, is adapted to receive an aqueous fluid that is supplied under pressure so that the aqueous fluid is forced through the pad (1; 101; 201; 401; 409; 501; 601; 701; 1003; 1103) for obtaining the beverage that then exits the pad (1; 101; 201; 401; 409; 501; 601; 701; 1003; 1103), wherein the pad (1; 101; 201; 401; 409; 501; 601; 701; 1003; 1103) includes a covering defining an interior space (19; 219; 419; 819) that is filled with a beverage preparation product for preparing the beverage, the pad containing 6-15 gram of soluble beverage preparation product, wherein the beverage preparation product includes a product soluble in an aqueous fluid, wherein the covering comprises a flexible first sheet (3; 103; 203; 403) and a rigid shell (7; 107; 207; 307; 407; 507), wherein the first sheet (3; 103; 203; 403) and the shell (7; 107; 207; 307; 407; 507) are connected to each other around their perimeter edges (5A, 5B; 405A, 405B), wherein the pad comprises only one outlet opening (11; 111; 411; 511), wherein the shell (7; 107; 207; 307; 407; 507) is equipped with the one outlet opening (11; 111; 411; 511) positioned centrically in the bottom (13; 113; 413; 513) of the shell (7; 107; 207; 307; 407; 507), wherein the pad (1; 101; 201; 401; 409; 501; 601; 701; 1003; 1103) is further equipped with a second sheet (27; 227; 427) that is positioned on a bottom (13; 113; 413; 513) of the shell (7; 107; 207; 307; 407; 507), wherein the second sheet (27; 227; 427) is located between the beverage preparation product and the shell (7; 107; 207; 307; 407; 507), and wherein the first sheet (3; 103; 203; 403) and the second sheet (27; 227; 427) each form a filter that allows an aqueous fluid, including water, and the beverage to pass and that forms a barrier for the beverage preparation product so that, when in use an aqueous fluid under pressure is supplied to the first sheet (3; 103; 203; 403) of the pad (1; 101; 201; 401; 409; 501; 601; 701; 1003; 1103) the aqueous fluid flows through the first sheet (3; 103; 203; 403) to the beverage preparation product so that the beverage is formed, which beverage then flows through the second sheet (27; 227; 427) and via the outlet opening (11; 111; 411; 511) leaves the pad (1; 101; 201; 401; 409; 501; 601; 701; 1003; 1103), and characterized in that said beverage preparation product is any soluble substance that comprises one or more from the group consisting of instant coffee, instant tea, a chocolate ingredient, instant milk powder/creamer, chicory, spices, and in that the outlet opening (11; 111; 411; 511) has a smallest diameter within a range from 0.88 to 0.94 mm, wherein the restriction formed by the outlet opening is less then the restriction formed by the beverage preparation product itself, wherein the outlet opening (11; 111; 411; 511) has a smallest through-flow area in a direction, in use, perpendicular to a beverage flow through the outlet opening (11; 111; 411; 511) within a range from 0.61 to 0.69 mm 2.