Capsule for preparing an edible product on a brewing device, and presenting: - a first construction element configured in a container-like form and adapted so as to provide a collection volume for a single portion of an edible substance, and - a second construction element configured in a circular lid-like form, and adapted so as to confine said collection volume of first construction element and as to provide an entry flow passageway to the interior of said first construction element, whereby said second construction element comprises a flow entry wall part that presents a disk-like general with a prevailing wall thickness (e 31) between two plane transversal relative to an axial axis of said flow entry wall part, whereby said flow entry wall part is provided in a rigid material, whereby said flow entry wall part comprises a passageway wall provided with a circular shape delimited by a first circumferential alignment and disposed centred relative to an axial axis of said capsule, whereby said flow passageway wall presents a weakened material region that develops along at least most part of said first circumferential alignment and that is adapted so that breaks under a given upstream flow pressure, whereby said flow entry wall part presents a recess region that develops in the upstream direction from the upstream oriented surface of said flow entry wall part, said capsule being characterized in that said recess region develops from a second circumferential alignment in the proximity of said passageway wall and so that defines an intercalary region between said recess region and said passageway wall, whereby said recess region presents a recess wall thickness (e 5) that is smaller than the prevailing wall thickness (e 31), and bigger than the passageway wall thickness (e 4) of said passageway wall. - a first construction element configured in a container-like form and adapted so as to provide a collection volume for a single portion of an edible substance, and - a second construction element configured in a circular lid-like form, and adapted so as to confine said collection volume of first construction element and as to provide an entry flow passageway to the interior of said first construction element, whereby said flow entry wall part is provided in a rigid material, whereby said flow entry wall part comprises a passageway wall provided with a circular shape delimited by a first circumferential alignment and disposed centred relative to an axial axis of said capsule, whereby said flow passageway wall presents a weakened material region that develops along at least most part of said first circumferential alignment and that is adapted so that breaks under a given upstream flow pressure, whereby said flow entry wall part presents a recess region that develops in the upstream direction from the upstream oriented surface of said flow entry wall part, said capsule being characterized in that said recess region develops from a second circumferential alignment in the proximity of said passageway wall and so that defines an intercalary region between said recess region and said passageway wall, whereby said recess region presents a recess wall thickness (e 5) that is smaller than the prevailing wall thickness (e 31), and bigger than the passageway wall thickness (e 4) of said passageway wall.