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 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, said capsule being characterized in that said passageway wall presents a passageway wall thickness (e 4) that is smaller than said prevailing wall thickness (e 31), and respective weakened material region is provided by means of a localized reduction of said passageway wall thickness (e 4), so that results a region with a weakened thickness (e 41) along said first circumferential alignment, thereby improving the opening of said passageway wall when impinged by a pressurized upstream flow. - 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 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, said capsule being characterized in that said passageway wall presents a passageway wall thickness (e 4) that is smaller than said prevailing wall thickness (e 31), and respective weakened material region is provided by means of a localized reduction of said passageway wall thickness (e 4), so that results a region with a weakened thickness (e 41) along said first circumferential alignment, thereby improving the opening of said passageway wall when impinged by a pressurized upstream flow. 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 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, said capsule being characterized in that said passageway wall presents a passageway wall thickness (e 4) that is smaller than said prevailing wall thickness (e 31), and respective weakened material region is provided by means of a localized reduction of said passageway wall thickness (e 4), so that results a region with a weakened thickness (e 41) along said first circumferential alignment, thereby improving the opening of said passageway wall when impinged by a pressurized upstream flow.